Inline every signature defined in the SDK (previously each translation unit had its own copy of the signature and function prototype). DLL init is near instant now (85% speed improvements).
* Added 2 new FileSystem pointers with new features in their classes.
* Register all factory instances created by the GameDLL in the SDK.
* Added new command 'fs_mount_vpk' to mount a specified VPK file.
* Renamed 'fs_decompress_pak' to 'fs_unpack_vpk'.
* Some renaming of Factory and VPK types.
* Some light optimizations/cleanup.