The main bulk of this is the new start screen code. To make this work in Raze some more work on the startup procedure is needed.
What this does provide is support for the DOS end-of-game text screens in Duke and SW on non-Windows systems.
This was caused by attempting to delete the camera textures when cleaning up the mirror array.
The Build tile manager was not prepared for such a use case and left a broken texture behind.
To allow this to function it now resets the texture replacement type when deleting a tile and to avoid creating new camera textures these will now be stored in a cache and recycled later.
Unlike Doom, a similar limit does not exist here and must not be enforced. Any texture from this folder needs to be usable by its full name without extension to be able to replace named tiles.
This is to allow giving them a texture ID so that they can be used from ZScript which has no access to naked textures.
This also consolidates AnimTexture and VpxTexture.
Game compiles and runs but transparency doesn't work yet.
# Conflicts:
# source/CMakeLists.txt
# source/core/menu/menu.cpp
# source/core/textures/buildtiles.cpp
