[r146] Gzdoom CMake Support - Patch included!

[Agent ME]

I've finished getting gzdoom to support cmake correctly. I've added all the gzdoom specific stuff to the cmakelists, including correct pk3 generation, and pointing updaterevision to the correct file. There are also a few random fixes - I added a linebreak to the end of one file to quiet the compiler warning, changed 'BOOL' to lowercase, brought zipdir up-to-date with zdoom's, etc.

And something it doesn't seem to be able to be done in the diff file I posted - some directories, such as wadsrc/Release, appear leftovers from a compiling and should be removed.

I wasn't sure what section to post this in, but I figured that incomplete cmake support was a bug and that it would get the most attention here by those who would need this.