Replace lzma with xz. Tweaks to fix debug builds.
Turn pack200 into an actual library
``Working'' forge unpackers. Needs a lot of hardening but good for alpha.
Add tweaks to make things build on windows
Implemented xz and pack200 unpackers required for proper forge installation.

Merge branch 'feature_forge_unpackers' into develop

Conflicts:
	CMakeLists.txt