entitymanager: remove duplication, move refcnt && !destroyed check into
helper function in preparation for caching result of that calculation
scriptglue: improved timer calibration
This was SVN commit r4113.
- split up detect.cpp into snd, cpu, gfx (headers were already split)
- rename detect functions for more clarity (e.g. get_cur_vmode ->
gfx_get_video_mode)
- rename lib/res/sound/snd to snd_mgr to avoid conflict with
sysdep/snd.cpp
- waio: set errno in aio_rw (addresses bug #73)
This was SVN commit r3745.