Rename zh (Mandarin) to cmn across the codebase.

See discussion in #933.

CHANGELOG.md

 *  Restructure "option brackets" language option to "brackets" and "bracketsAnnounced".
 *  New Language option: "lowercaseSentence" for ending a sentence if a period is followed by a lower case letter.
 *  Added voice variants
+*  Renamed zh to cmn (Mandarin)
+*  Renamed zhy to yue (Cantonese)
 
 documentation:
 * Add documentation about voice and language options.

Makefile.am

 	phsource/ph_bulgarian \
 	phsource/ph_catalan \
 	phsource/ph_cherokee \
+	phsource/ph_cmn \
 	phsource/ph_consonants \
 	phsource/ph_croatian \
 	phsource/ph_czech \
 	phsource/ph_wolof \
 	phsource/ph_yoruba \
 	phsource/ph_yue \
-	phsource/ph_zh \
 	phsource/phonemes \
 	src/espeak-ng
 	ESPEAK_DATA_PATH=$(CURDIR) src/espeak-ng --compile-intonations && \
 	espeak-ng-data/bs_dict \
 	espeak-ng-data/ca_dict \
 	espeak-ng-data/chr_dict \
+	espeak-ng-data/cmn_dict \
 	espeak-ng-data/cs_dict \
 	espeak-ng-data/cv_dict \
 	espeak-ng-data/cy_dict \
 	espeak-ng-data/ur_dict \
 	espeak-ng-data/uz_dict \
 	espeak-ng-data/vi_dict \
-	espeak-ng-data/yue_dict \
-	espeak-ng-data/zh_dict
+	espeak-ng-data/yue_dict
 
 af: espeak-ng-data/af_dict
 espeak-ng-data/af_dict: dictsource/af_list dictsource/af_rules dictsource/af_extra dictsource/af_emoji
 vi: espeak-ng-data/vi_dict
 espeak-ng-data/vi_dict: dictsource/vi_list dictsource/vi_rules dictsource/vi_extra dictsource/vi_emoji
 
-zh: espeak-ng-data/zh_dict
-dictsource/zh_listx:
-	ln -svf extra/zh_listx dictsource/
-if HAVE_ZH_EXTENDED_DICTIONARY
-espeak-ng-data/zh_dict: dictsource/zh_list dictsource/zh_rules dictsource/zh_listx dictsource/zh_extra dictsource/zh_emoji
+cmn: espeak-ng-data/cmn_dict
+dictsource/cmn_listx:
+	ln -svf extra/cmn_listx dictsource/
+if HAVE_CMN_EXTENDED_DICTIONARY
+espeak-ng-data/cmn_dict: dictsource/cmn_list dictsource/cmn_rules dictsource/cmn_listx dictsource/cmn_extra dictsource/cmn_emoji
 else
-espeak-ng-data/zh_dict: dictsource/zh_list dictsource/zh_rules dictsource/zh_extra dictsource/zh_emoji
+espeak-ng-data/cmn_dict: dictsource/cmn_list dictsource/cmn_rules dictsource/cmn_extra dictsource/cmn_emoji
 endif
 
 yue: espeak-ng-data/yue_dict
 	espeak-ng-data/mbrola_ph/ar1_phtrans \
 	espeak-ng-data/mbrola_ph/ar2_phtrans \
 	espeak-ng-data/mbrola_ph/ca_phtrans \
+	espeak-ng-data/mbrola_ph/cmn_phtrans \
 	espeak-ng-data/mbrola_ph/cr1_phtrans \
 	espeak-ng-data/mbrola_ph/cs_phtrans \
 	espeak-ng-data/mbrola_ph/de2_phtrans \
 	espeak-ng-data/mbrola_ph/tr1_phtrans \
 	espeak-ng-data/mbrola_ph/us_phtrans \
 	espeak-ng-data/mbrola_ph/us3_phtrans \
-	espeak-ng-data/mbrola_ph/vz_phtrans \
-	espeak-ng-data/mbrola_ph/zh_phtrans
+	espeak-ng-data/mbrola_ph/vz_phtrans
 
 espeak-ng-data/mbrola_ph/%_phtrans: phsource/mbrola/% src/espeak-ng
 	mkdir -p espeak-ng-data/mbrola_ph

configure.ac

     [AS_HELP_STRING([--with-extdict-ru], [use the extended Russian Dictionary file @<:@default=no@:>@])],
     [])
 
-AC_ARG_WITH([extdict-zh],
-    [AS_HELP_STRING([--with-extdict-zh], [use the extended Mandarin Chinese Dictionary file @<:@default=no@:>@])],
+AC_ARG_WITH([extdict-cmn],
+    [AS_HELP_STRING([--with-extdict-cmn], [use the extended Mandarin Chinese Dictionary file @<:@default=no@:>@])],
     [])
 
 AC_ARG_WITH([extdict-yue],
 	have_extdict_ru=no
 fi
 
-if test "$with_extdict_zh" = "yes" ; then
-	have_extdict_zh=yes
+if test "$with_extdict_cmn" = "yes" ; then
+	have_extdict_cmn=yes
 else
-	have_extdict_zh=no
+	have_extdict_cmn=no
 fi
 
 if test "$with_extdict_yue" = "yes" ; then
 fi
 
 AM_CONDITIONAL(HAVE_RU_EXTENDED_DICTIONARY,  [test x"$have_extdict_ru"  = xyes])
-AM_CONDITIONAL(HAVE_ZH_EXTENDED_DICTIONARY,  [test x"$have_extdict_zh"  = xyes])
+AM_CONDITIONAL(HAVE_CMN_EXTENDED_DICTIONARY,  [test x"$have_extdict_cmn"  = xyes])
 AM_CONDITIONAL(HAVE_YUE_EXTENDED_DICTIONARY, [test x"$have_extdict_yue" = xyes])
 
 dnl ================================================================
 
         Extended Dictionaries:
             Russian:                   ${have_extdict_ru}
-            Chinese (Mandarin):        ${have_extdict_zh}
+            Chinese (Mandarin):        ${have_extdict_cmn}
             Chinese (Cantonese):       ${have_extdict_yue}
 ])

docs/building.md

 | Option               | Extended Dictionary | Default |
 |----------------------|---------------------|---------|
 | `--with-extdict-ru`  | Russian             | no      |
-| `--with-extdict-zh`  | Mandarin Chinese    | no      |
+| `--with-extdict-cmn` | Mandarin Chinese    | no      |
 | `--with-extdict-yue` | Cantonese           | no      |
 
 The extended dictionaries are taken from

espeak-ng-data/lang/sit/cmn

 language zh-cmn
 language zh
 
-phonemes zh
-dictionary zh
+phonemes cmn
+dictionary cmn
 words 1
 pitch 80 118
 

phsource/phonemes

 phonemetable ba base1
 include ph_bashkir
 
+phonemetable cmn base1
+include ph_cmn
+
 phonemetable cy base1
 include ph_welsh
 
 phonemetable wo base1
 include ph_wolof
 
-phonemetable zh base1
-include ph_zh
-
 phonemetable yue base1
 include ph_yue
 

src/libespeak-ng/tr_languages.c

 		break;
 	case L3('c', 'm', 'n'): // no break, just go to 'zh' case
 	case L3('y', 'u', 'e'):
-	case L('z','h'):
+	case L('z','h'):	// zh is used for backwards compatibility. Prefer cmn or yue.
 	{
 		static const short stress_lengths_zh[8] = { 230, 150, 230, 230, 230, 0, 240, 250 }; // 1=tone5. end-of-sentence, 6=tone 1&4, 7=tone 2&3
 		static const unsigned char stress_amps_zh[] = { 22, 16, 22, 22, 22, 22, 22, 22 };

src/windows/data.vcxproj

   <Target Name="vi" Inputs="$(ProjectDir)..\..\dictsource\vi_rules;$(ProjectDir)..\..\dictsource\vi_list" Outputs="$(ProjectDir)..\..\espeak-ng-data\vi_dict" DependsOnTargets="Phonemes">
     <Exec Command="cd $(ProjectDir)..\..\dictsource &amp;&amp; $(TargetDir)espeak-ng.exe --path=$(ProjectDir)..\.. --compile=vi" />
   </Target>
-  <Target Name="zh" Inputs="$(ProjectDir)..\..\dictsource\zh_rules;$(ProjectDir)..\..\dictsource\zh_list" Outputs="$(ProjectDir)..\..\espeak-ng-data\zh_dict" DependsOnTargets="Phonemes">
-    <Exec Command="cd $(ProjectDir)..\..\dictsource &amp;&amp; $(TargetDir)espeak-ng.exe --path=$(ProjectDir)..\.. --compile=zh" />
+  <Target Name="cmn" Inputs="$(ProjectDir)..\..\dictsource\cmn_rules;$(ProjectDir)..\..\dictsource\cmn_list" Outputs="$(ProjectDir)..\..\espeak-ng-data\cmn_dict" DependsOnTargets="Phonemes">
+    <Exec Command="cd $(ProjectDir)..\..\dictsource &amp;&amp; $(TargetDir)espeak-ng.exe --path=$(ProjectDir)..\.. --compile=cmn" />
   </Target>
   <Target Name="yue" Inputs="$(ProjectDir)..\..\dictsource\yue_rules;$(ProjectDir)..\..\dictsource\yue_list" Outputs="$(ProjectDir)..\..\espeak-ng-data\yue_dict" DependsOnTargets="Phonemes">
     <Exec Command="cd $(ProjectDir)..\..\dictsource &amp;&amp; $(TargetDir)espeak-ng.exe --path=$(ProjectDir)..\.. --compile=yue" />
   </Target>
-  <Target Name="Dictionaries" DependsOnTargets="af;am;an;ar;as;az;bg;bn;bs;ca;cs;cy;da;de;el;en;eo;es;et;eu;fa;fi;fr;ga;gd;gn;grc;gu;hi;hr;hu;hy;ia;id;is;it;jbo;ja;ka;kl;kn;ko;ku;ky;la;lfn;lt;lv;mk;ml;mr;ms;mt;my;nci;ne;nl;no;om;or;pa;pap;pl;pt;ro;ru;si;sk;sl;sq;sr;sv;sw;ta;te;tn;tr;tt;ur;vi;yue;zh" />
+  <Target Name="Dictionaries" DependsOnTargets="af;am;an;ar;as;az;bg;bn;bs;ca;cmn;cs;cy;da;de;el;en;eo;es;et;eu;fa;fi;fr;ga;gd;gn;grc;gu;hi;hr;hu;hy;ia;id;is;it;jbo;ja;ka;kl;kn;ko;ku;ky;la;lfn;lt;lv;mk;ml;mr;ms;mt;my;nci;ne;nl;no;om;or;pa;pap;pl;pt;ro;ru;si;sk;sl;sq;sr;sv;sw;ta;te;tn;tr;tt;ur;vi;yue" />
 </Project>

src/windows/installer/Product.wxs

             <Component Id="vi_dict" Win64="$(var.Win64)" Guid="F4E1855E-A1C8-4DE1-A72F-0835C7794314">
               <File Name="vi_dict" Source="$(var.ProjectDir)..\..\..\espeak-ng-data\vi_dict" KeyPath="yes"/>
             </Component>
-            <Component Id="zh_dict" Win64="$(var.Win64)" Guid="6DF6E437-BF8B-4FCD-B094-D88C65ACDE6E">
-              <File Name="zh_dict" Source="$(var.ProjectDir)..\..\..\espeak-ng-data\zh_dict" KeyPath="yes"/>
+            <Component Id="cmn_dict" Win64="$(var.Win64)" Guid="6DF6E437-BF8B-4FCD-B094-D88C65ACDE6E">
+              <File Name="cmn_dict" Source="$(var.ProjectDir)..\..\..\espeak-ng-data\cmn_dict" KeyPath="yes"/>
             </Component>
             <Component Id="yue_dict" Win64="$(var.Win64)" Guid="D6BF57DA-A408-40FC-9D8E-610C8AED5836">
               <File Name="yue_dict" Source="$(var.ProjectDir)..\..\..\espeak-ng-data\yue_dict" KeyPath="yes"/>
     </ComponentGroup>
     <ComponentGroup Id="LangChineseMandarin">
       <ComponentRef Id="cmn"/>
-      <ComponentRef Id="zh_dict"/>
+      <ComponentRef Id="cmn_dict"/>
     </ComponentGroup>
     <ComponentGroup Id="LangCroatian">
       <ComponentRef Id="hr"/>