Finishing *.obj export. Made Picking more productive. Made fill/render mode more predictable.

SAModel.Direct3D
- Updated Camera class to have a DrawDistance value
- New basicmodel obj export now resides here.

SADXLVL2, SALVL
- Changed Mouse Picking to use camera's draw distance as it's cutoff.
Items that are significantly past the drawdistance are no longer
selectable.
- fixed obj export. UVs now import properly. A glitch causing redundant
poly data has been removed.

SADXLVL2, SAMDL, and SALVL:
- Changed MainForm.DrawLevel() to use camera's DrawDistance for the
projection matrix
- set default FillMode to FillMode.Solid instead of undefined. Certain
users will no longer get unexpected modes on startup.