[Reduction] #184-186: RTC interrupt manager
[Reduction] #187-188: bgm_timer_init and bgm_timer_finish

[Binary change] Order of 2 relocations in TH04's MAINE.EXE and TH05's OP.EXE
and MAINE.EXE.
[Reduction] #189-190: bgm_init and bgm_finish

And that's all the games seem to use from the master.lib BGM module.