* Move sound_init to make sure it gets called everytime user preferences is reloaded. * Merged sound_reinit and sound_init. One used user preferences while the other did not, don't see the point of this, so just made it always use user preferences now. * Timeline header audio sync option now controls scene flag rather than timeline flag. Since it uses the same playback operator now, there is no distinction anymore. * Added boolean property sync to animation play operator, to sync with audio or not. Uses scene setting if property is not set. * Playback stop button in info header now calls operator, so sounds stop playing too.