NEVERHOOD: Fix looping sounds (bug #6473)

Based on salty-horse's patch - thanks!
FULLPIPE: Implement sceneHandler11_jumpFromSwing()
FULLPIPE: More code to scene11
FULLPIPE: Implement sceneHandler11_swingerJumpDown()
FULLPIPE: Implement scene11_dudeSwingCallback()
FULLPIPE: Give proper names to subs in scene11
FULLPIPE: Rename variables in scene11
FULLPIPE: Renames in scene11. This completes the scene
NEVERHOOD: Close the game menu when pressing the Escape key