Add textured line overlay rendering.
Change terrain height calculations to be triangulation-dependent for
improved accuracy.
Add triangulation-dependent terrain normal function.
Support separate S/T wrap modes for textures.
Rename CVector2D_Maths since it no longer conflicts with simulation
CVector2D.
Coalesce freed chunks in vertex buffers, to avoid excessive
fragmentation.
Add some things to help debug vertex buffer allocation a little.
This was SVN commit r9929.
Use index VBOs in model renderers, for performance.
Be more explicit about static/dynamic VBOs.
Add VBO usage to renderer stats.
Clean up some obsolete unused code.
This was SVN commit r9052.
which is just "class C { void C::f(); }" code, which other compilers
seem to have ignored.
Also removed HAVE_PCH from GCC because our build system doesn't have
PCH. Added necessary headers to make it compile again.
This was SVN commit r4437.