Feature: simplify texture replacement

[Trass3r]

https://keeperklan.com/threads/220-DK2-texture-format/page6?p=40807#post40807

Further experimentation reveals that, while DK2 will preferentially load textures from the texture cache, if (and ONLY if) an entry for any of the mipmaps of, say, Bar_Table is not present in the texture cache, it will attempt to load Data\EngineTextures\Bar_Table.png instead. I'm writing a small program to disable texture cache entries that have counterparts on disk; this should make life easier for texture pack creators.
DK2Recache.zip
You will have to run it once every time you add or remove a "patch" texture.

That check should be removed so it prefers the png if present. Just like it does for other resources.
See #61 #67.