Added more jump ops and fixed bugs

Added the ability to do jump.if0 and jump.if1 as we make things more flexible
that way. Added new modes to mnemonic.c and fixed sprintf bugs in unparse.c.
The bit field (: 16) in the core structure has been removed as it is redundant
in this case.
Reimplemented jump
Updated move operations
Finished implementing the rest of the misc ops
Finished extending the core of iris