Music: start using BASS instead of libzplay.
Music: start using BASS instead of libzplay.

Found several issues with Libzplay:
1. sometimes libzplay can't pause music track. F.e. if you try to do it before video start in KM_Video
2. fadeout could play music on high volume for a short period of time just before the start of fade out. Could be seen recently after 'Victory / defeat' musicm, when game music started to fadeout back
thibmo/kam_remake,reyandme/kam_remake,reyandme/kam_remake,reyandme/kam_remake,thibmo/kam_remake,thibmo/kam_remake,reyandme/kam_remake,thibmo/kam_remake,thibmo/kam_remake,reyandme/kam_remake