Added a distinction between constant numbers and what are effectively memory addresses (i.e. strings and labels).

src/token.c

@@ -28,8 +28,9 @@ TokenClass GetTokenClass(TokenType type) {
         case STRING:
         case IDENTIFIER:
         case LABEL:
+            return Address;
         case NUMBER:
-            return Immediate16;
+            return Constant;
         default:
             return None;
     }