Parser now uses updated lexer

Much simpler, uses a switch case which is a much faster method of
doing the parsing.  Though roughly equivalent in terms of LOC, I feel
that this is more extensible

asm/parser.h

@@ -22,6 +22,7 @@ typedef enum
   PERR_OK = 0,
   PERR_INTEGER_OVERFLOW,
   PERR_NOT_A_NUMBER,
+  PERR_EXPECTED_UTYPE,
   PERR_EXPECTED_TYPE,
   PERR_EXPECTED_SYMBOL,
   PERR_EXPECTED_OPERAND,