add snes target definition
add first draft of snes libsrc
* get_tv
* waitforblank

customize makefile to only compile currently supported files for a 65816 target
add support to 65816 in da65
typo fix in switch statement
fix "jsl" opcode size
add some 65816 related addressing for 65816
base snes lib
snes lorom 32k config
fix crt0.s due to some bad 65816 code handling
 add DMA registers defines