Tokenizer now outputs opcodes as their own token.

src/MOS/6502/assembler/tokenizer.js

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