- Added possibility to turn off mainloop event handling
- Check interrupts even when not handling events
- Be more carefulabout which events we want
- Use different method to determine fg/bg

cycles for background apps. MacOS has a new method to set the amount
of time for bg apps.

added some generated modules

generated from the header files (with some hand-holding :-).

Added some new-fangled features to bgenOutput.  Generate doc strings!

the former had their arguments reversed compared to all Apple's
routines (e.g. FSpOpenResFile()).

Also fixed the SoundMgr UserRoutine (Jack fixed it but put the fix
between #ifdef __MWERKS__ ... #endif :-( ).

NB eventually this module should disappear in favor of separate
modules per manager (e.g. Resources, Sound, Files, ...).