Change: Terrain Location

Changed location of the Terrain definitions to the terrains folder in
the sprites folder.

Also moved the Desert tile folder to the same location.
Remove: Bits Folder

Replaced all the content in the Bits folder and put them in the
appropriate folders for their file types.

The AUD and SHP files have not been placed specifically to a location
yet; they have not been examined to put them in the right folders.
Change: Moved Bits Files

The majority of the Bits files have been moved to a related folder. The
remaining could not be determined, and were left alone.