shn: add stubs for tone marks, add replacements for Shan numbers

dictsource/shn_rules

 // Shan (Tai Yay) pronunciation rules (Burmese script)
 
+.replace
+       ႐    0
+       ႑    1
+       ႒    2
+       ႓    3
+       ႔    4
+       ႕    5
+       ႖    6
+       ႗    7
+       ႘    8
+       ႙    9
+
 .group င // U+1004
          င         N
 
            
            
 .group  ၵ်
-         _) ၵ်      k   // temporary word        
+         _) ၵ်      k   // temporary word        
+
+.group  း
+             း      1 // FIXME there should be more proper rules for this
+
+.group  ႇ
+             ႇ      2
+
+.group  ႈ
+             ႈ      3
+
+.group  ႉ
+             ႉ      5 // FIXME there should be more proper rules for this
+
+.group  ႊ
+             ႊ      5
+
+.group  ႋ
+             ႋ      i2
+
+.group  ႌ
+             ႌ      i3
+
+.group  // all other symbols, if necessary