Updated the Parser to try and give 'AddressParameter's more meaning depending on the SymbolType.

misc/test.asm

@@ -1,5 +1,7 @@
 .db video_start 0xF37F
 .db msg "Hello, world!", 0
+.db NOTERM "No terminating byte here"
+.db null_byte 0
 
 load r1, [msg] ; Because the lod* instructions can't load an address
                ; from anything but a register, this becomes laa r1, [msg]
@@ -11,7 +13,7 @@ load r1, [msg] ; Because the lod* instructions can't load an address
 string_length:
 loadb r3, [r1] ; Load the byte from the address in R1, into R3
 load r2, 0 ; String length
-cmp r3, 0 ; Is R3 a null byte?
+cmp r3, null_byte ; Is R3 a null byte?
 je end
 inc r2