unify(heightmap): Merge Height Map related code and move Height Map and Terrain related files to Core

[xezon]

• Merge after unify(texture): Merge W3DWater and WW3D2 texture code #1989

This change contains commits of #1989

This change has 3 commits:

The first commit fixes include paths in Height Map related files, which is required when moving files to Core. The second commit merges all the various Height Map code and moves several Zero Hour specific source files to Core. The third commit moves all Height Map and Terrain related files to Core.

Zero Hour fixes

One minor Zero Hour specific mistake was identified in TerrainTextureClass::update, where a IDirect3DSurface8 was not released on a fail path.

Generals changes

Generals get's a lot of changes. Most notably a huge refactor in HeightMap and WorldHeightMap, which was split into more files and classes: BaseHeightMap and FlatHeightMap.

It also gets most of the code for DO_SEISMIC_SIMULATIONS, except in BunkerBusterBehavior. It is compiled out and therefore does nothing. In Zero Hour code I dialed back a bit of the excessive empty whitespace that it had added.

It also gets all the changes for W3DPropBuffer and W3DTreeBuffer, which are owned by BaseHeightMap. They are practically unused because nothing gets added to them yet.

W3DRoadBuffer was not fully merged yet, just partially merged to make it compile.

WW3D2's shader and dx8caps, among many other files, only got the changes necessary to make it compile and run.

[xezon]

Ran against 2 Generals Replays. Worked.

[Skyaero42]

Could not detect any issues

Also ran several replays, no mismatches.

[xezon]

The first 2 commits compile on their own too.