Added more instructions for the parser to emit and refactored the code in doing so.

src/opcodes.c

@@ -13,7 +13,8 @@ Instruction instructions[OPCODECOUNT] = {
     { "cmp", CMP, Reg, Reg | Constant },
     { "in", IN, Constant | Reg, None},
     { "out", OUT, None, None},
-    { "nop", NOP, None, None}
+    { "nop", NOP, None, None},
+    { "jz", JZ, Address, None}
 };
 
 unsigned char GetInstructionMask(TokenType type, TokenClass parameterOneType) {