Highlight type param

This is one of the few remaining unambiguous things in our syntax (uuugh), so let's at least highlight this first.

Author: chenglou

ReScript.sublime-syntax

@@ -121,6 +121,10 @@ contexts:
     - match: '''[\x00-\x7F]'''
       scope: string.quoted.single
 
+  typeParameter:
+    - match: '''[A-Za-z][A-Za-z0-9_]*'
+      scope: support.type
+
   number:
     - match:
         \b(0[xX][a-fA-F0-9_]+[Lln]?|0[oO][0-7_]+[Lln]?|0[bB][01_]+[Lln]?|[0-9][0-9_]*([Lln]|(\.[0-9_]+)?([eE][-+]?[0-9_]+)?)?)\b
@@ -285,6 +289,7 @@ contexts:
     - include: commentLine
     - include: commentBlock
     - include: character
+    - include: typeParameter
     - include: string
     - include: attribute
     - include: function

syntax_test.res

@@ -132,11 +132,13 @@ let asd = foo["bar"]
 
 type bla<'a> = {
 // <- storage.type
+//       ^^ support.type
 //             ^ punctuation.section.braces.begin
   a: int,
 // ^ punctuation.separator
 //      ^ punctuation.separator
   ok: 'a,
+//    ^^ support.type
 }
 // <- punctuation.section.braces.end