2) Bugfix: certain sfx (esp. engine sound) would not get started
correctly when changing sfx settings during a race.
3) Bugfix: Engine sound would be played if the in-race-menu was shown.
3) Allocating and deallocating SFX objects is now completely done
in SXFManager (and not allocated in SFXmanager, but deallocated
via a normal delete call).
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2285 178a84e3-b1eb-0310-8ba1-8eac791a3b58
and add engine sounds.
2) Added sfx manager so that the buffers for the sfx are shared between
all sfx objects.
3) Moved all audio related files into audio subdirectory.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2275 178a84e3-b1eb-0310-8ba1-8eac791a3b58
