Imptux WIP

Well, made some pretty good progress today. Now have collision detection, position deformation and constraint inside terrain cage. Some less visible stuff like startup library version checking, more tweaks to the render loop and integration of piman's GProfiler tool.

Not really sure what I should work on next. Probably work on the terrain a bit more or add some life to the vehicles. Not sure what to do about enemy AI and combat, this may turn out to be very dull in some regards =)