Prevent some assembler breakages

[vvulpes0]

• high byte of INTEGER constant and LP_STRING length shifted to byte range in their respective byte arrays, preventing a crash
• INTEGER modified to take an I16_OR_LABEL rather than just I16, to match the semantics of SET and to allow for preloaded vtables
• place "v2.0 raw" at the top of generated files to match Hassem
• place newline at end of ldata files like is done for lcode files
• use __main__ instead of __init__ to pull in main

[vvulpes0]

In the sample code below, the INTEGER(0xcafe) and LP_STRING(…) lines would previously cause a crash in the assembler. While fixing this, I added the ability to place labels as INTEGER constants to match the semantics of SET.

DLABEL(bigint)
INTEGER(0xcafe)
DLABEL(smallstr)
LP_STRING("test")
DLABEL(bigstr)
LP_STRING("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
DLABEL(addresses)
INTEGER(bigint)
INTEGER(bigstr)
INTEGER(main)

CBON()
LABEL(main)
SET(R1,bigint)
SET(R2,bigstr)
SET(R3,main)
SET(R4,end_main)
SUB(R5,R4,R3)
LABEL(end_main)