SDL: Avoid having SDL_SRCALPHA set even if we have alpha in the pixelformat.
Merge pull request #420 from somaen/disableSDLAlpha

SDL: Avoid having SDL_SRCALPHA set even if we have alpha in the pixelformat.
FULLPIPE: More code to scene34
FULLPIPE: Yet more code to scene34
FULLPIPE: Implement sceneHandler34_setExits()
FULLPIPE: Implement sceneHandler34_testVent() and showVent()
FULLPIPE: Implement sceneHandler34_animateAction()
FULLPIPE: Implement sceneHandler34_animateLeaveBoard()
FULLPIPE: Implement sceneHandler34_genFlies()
FULLPIPE: Renames in scene34. This completes the scene
WINTERMUTE: Limit the range of the panning-variable to stay within [-1,1].

Also, store the panning state, so that the next playback starts with the same pan.
FULLPIPE: Implement FullpipeEngine::updateMap()
FULLPIPE: Sort scenes in updateMap()
NEVERHOOD: Fix for bug #6493: "NEVERHOOD: Many sounds playback as loud static (Wii)"
NEVERHOOD: Fix for bug #6481: 'NEVERHOOD: Wrong walk sound in navigation scene'