en-GB-x-rp: initial support for the EXPLORE lexical set using words from The Raven

dictsource/en_rules

    yst) em (i      Em
 
 .group en
-     _) en (@      %En
-     _) en (g@     %EN // velarized
+     _) en (@      %e#n
+     _) en (g@     %e#N // velarized
         en (_$w_alt1 En
      &) eness (_S4 n@s
     &r) en (@      En
      _) ena (m     I2na
      &) en (Ance   @n
      &) en (ch     En
-     _) encha (n   %EntSaa
+     _) encha (n   %e#ntSaa
         enclav     EnkleIv
         en (core   0n
      &) ency (_    @ns%i
    _tr) ev (@@     I#v
 
 .group ex
-     _) ex (@      %Eks
+     _) ex (@      %e#ks
         excav      Eksk@v
      _) exc (e     %Eks
         exc (i     %Eks

phsource/ph_english

 endphoneme
 
 
+phoneme e# // **E**XPLORE
+  vwl
+  ChangePhoneme(E)
+endphoneme
+
+
 phoneme a#2  // for word 'an'
   vwl
   IF next2Ph(isVowel) THEN

phsource/ph_english_rp

   IfNextVowelAppend(r-)
   FMT(vwl_en_rp/aU@)
 endphoneme
+
+
+phoneme e# // **E**XPLORE
+  vwl
+  ChangePhoneme(I)
+endphoneme