Warning fixes from printz's list.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2798 86ba831e-150c-0410-ab35-e06eaae15ed9
Fixed a typo.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2799 86ba831e-150c-0410-ab35-e06eaae15ed9
Hopefully not overkill solution to problem with D_DDTBLU: send an all-notes-off event to each MIDI track at the end. Seems to work.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2800 86ba831e-150c-0410-ab35-e06eaae15ed9
* Refactor music cheats to use a routine from GameModeInfo
* Don't include p_mobj.h in s_sound.h

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2801 86ba831e-150c-0410-ab35-e06eaae15ed9