Terrain system limitations

[InsanityBringer]

When using high FOV settings on large, open terrains, the render depth will frequently be reset and occasionally issues will occur as a static limit of 8000 unique terrain cells is reached. Patching this will be nontrivial, but I think I can fix it by outright replacing the terrain module with a new one.

Due to the large amount of patch points present, it may be worth switching to a new method of loading patch points, which translates patch points from one engine version to others.

[Sol1vaN]

Yea, the large terrains always have some cropping on the distant places.
It will be great to see all d3 terrain at same time, without croppings