* Add "__m68k_" prefix to `trap()` to indicate that it's a CPU
intrinsic
* `__m68k_trap()` now takes the trap number as a parameter, which
lines up better with established 68k norms (`TRAP #n` is the
assembly syntax)
* Specify instruction alignment to be 2 bytes
* Fully decode the status register (add trace and supervisor flags and interrupt priority)
* Decode TRAPs into the vector addresses to make code easier to follow