Audio Config File + Landing Sound

A landing sound is now played in the same manner the footstep sounds
are. An audio config file has been created allowing the adjusting of
audio file paths and volumes.

The non-Player audio stuff in the config file not implemented yet.
Audio Expanded Upon

Audio Options, all configurable from AudioConfig, now include
Player Jump, Footstep, Landing, Kick, and Farting Sounds
Level Music
Two tracks of ambience, a ground-level one and a sky-level one, which
crossfade depending on your altitude, you can alter the altitude in
AudioConfig.xml
The fast falling sound is triggered once you exceed the speed defined as
the fastFallTriggerSpeed in the config file

All of these options have volume fields in the config file to adjust the
levels
Also added a field like this in dialogueCharacterConfig to alter speech
volume