8.0.C - CartDetector, AR/GS V2/V3 support, Exception Handler, SIO V2, etc

Big update!

- Exception Handler
- Self correcting SIO protocol
- AR/GS V2 support (with gap)	
- PAR3, XP, etc detection + support
- New CD routines	
- CartDetector + manual cart definition

Huge thanks to Nicolas Noble for helping with so much, to Squaresoft74 for testing and advice and to Danhans42 for the music he shared with the world (plus some pointers on cart detection techniques).

Complete:
- Fixed some accidental double-bytes in the hex editor
- new CD boot routine using file browser
- exception handler
- nicolas tidied a ton of things up
- rewrote the TTY redirect in C
- moved IsROM over to the makefile/linker
- Tri+ Left/Right/Up/Down for a quick increment in the hex editor
- converted ex handler to C
- opened up various parts of the memory map to writing
- made CD drive properly wait	
- Auto cart detection
- Datel V2/V3 support
- Credit for krHACKen / kHn	
- W29EE011 support
- SST 39SF020 support
- SST 39VF040 support