Redid BGM and SFX object hierarchy as well as attached them to scripts in LevelBase.unity.  Added a GetLastWayPointName() in Path.cs.  Added BGM and SFX switching in MoveState.cs.  Updated a SoundManager StopWalkSFX() call in MoveThenDoState.cs as well as MoveToObjectState.cs.  Added a few new strings (CURRENTAREA, LASTAREA, NEXTAREA) to Strings.cs.  Updated CoroutineFadeUp and CoroutineFadeDown in Crossfade.cs.  Updated PlayWalkSFX and StopWalkSFX in SoundManager.cs.  Added in a bunch of BGM and SFX.