Fixes for spawn points, models, etc

Version 0.91 fixes some problems:

• Models inside rocks. Since these were mostly grasses it didn't make sense for them to be on top of the rocks either.
• Flags sometimes being inside of rocks
• Spawn points and headquarters locations sometimes hanging around in mid air. Spawn points were automatically dropped down by COD2, but the headquarters had an unpleasant tendency to hover in midair in devilishly difficult (or impossible) to capture locations.