This is the first half of some major rework of the g13d codebase to make things
a bit more manageable. This splits out a great deal of stuff from helper.h into
separate translation units, and also breaks out a great deal of the g13.h header
into separate translation units as well.
Doing this saves in compilation time as we make changes to the system, and also
helps to clean up a whole bunch of leaking symbols.