Because stronger types are better types, and this will make
future refactoring easier. I considered trying to purge the Opcode
type from the codebase too but that would be a much bigger project.
I was going to #include translator.h in a header I had for
talking to the region selector thing and decided to just get this over
with instead. (It shouldn't need to #include that.) Found a few
other unused things to remove while at it.
bsimmers