TLPX and TLBX loading
Merge branch 'master' of https://github.com/jaquadro/Treefrog into FormatX
Full reading implemented
Mostly complete multi-file write support
Texture converted to use UID only
Object classes converted to Guid
Tiles converted to UID with local index map
Brushes converted to UID
Added Uid to object instances
Relocating new proxy classes
Project refactoring
Removing old framework cruft
Even more cruft removal
Project and Level write out their PropertyGroups
Adding Library to model.
Adding Guids in more places; removing some warnings.
Library work
Sweeping refactoring, partially functional.
Several bugfixes from uid conversion
Major Tile/TilePool layer refactoring.  Ugh.