InputCommon/ExpressionParser: Add compound assignment operators.

Source/Core/InputCommon/ControlReference/ExpressionParser.h

@@ -30,18 +30,20 @@ enum TokenType
   TOK_COLON,
   // Binary Ops:
   TOK_BINARY_OPS_BEGIN,
+  TOK_COMPOUND_ASSIGN_OPS_BEGIN = TOK_BINARY_OPS_BEGIN,
   TOK_AND = TOK_BINARY_OPS_BEGIN,
   TOK_OR,
+  TOK_XOR,
   TOK_ADD,
   TOK_SUB,
   TOK_MUL,
   TOK_DIV,
   TOK_MOD,
-  TOK_ASSIGN,
+  TOK_COMPOUND_ASSIGN_OPS_END,
+  TOK_ASSIGN = TOK_COMPOUND_ASSIGN_OPS_END,
   TOK_LTHAN,
   TOK_GTHAN,
   TOK_COMMA,
-  TOK_XOR,
   TOK_BINARY_OPS_END,
 };