EMI: Various sound fixes

This patch set fixes the following:

- remove "Out of regions" warning
- loosen the check for correct PlaySound parameters (the demo as well as Murray on Jambalaya seem to use a wrong 2nd parameter)
- don't restart tracks when setting the same track via setMusicState (fixes constantly repeating the first notes of the music on the Jambalaya map)
- implement ImStateHasLooped (used for selecting various tracks in Knutting Town)