Terrain animation

Terrain can now be animated through its frame parameter, just like a regular mdl model.

DirectX 8.1

A5 now uses the DirectX 8.1 interface, instead of DirectX 7.

u,v (DX8 only)

Texture u/v offsets are now also implemented for model, terrain, and sprite entities.

High resolution lights

When setting the hires flag of a light in WED, the shadows cast by this light are rendered in double resolution. The advantage is that these shadows look much better.