Mobile troubles and asset work

Working through some mobile physics bugs without breaking the desktop version has been an interesting challenge. We're also starting to clean up some of our 4k textures on mobile, the beginning of the fork for mobile vs desktop/console assets. The OBB file is still under 1GB, but it's almost entirely textures at the moment. Since the majority of the major assets are done, this seems like a good time to fork that.

With any luck, this pre-alpha should have the majority of the assets in a working state. Foley work is ongoing.

Best of all, we finally have a build working on Linux!