Tokenizer now outputs opcodes as their own token.

src/MOS/6502/assembler/tokenizer.js

@@ -1,4 +1,4 @@
-
+const OP = require('./op.js');
 
 function GetTextStream(input){
   var pos = 0;
@@ -165,6 +165,8 @@ class Tokenizer{
 
   readLabel(){
     var str = this.readWhile(isLabel);
+    if (OP.isCode(str.toUpperCase()))
+      return this.genTokenObject('opcode', str.toUpperCase());
     return this.genTokenObject('label', str);
   }