AnimFix

• Complete reimplementation of the texture stitcher, now it should be working correctly and all weird texture bugs should be gone.
• Modernized config system
• Updated to FalsePatternLib 0.9.x
• Main menu config gui. Changing the batching threshold here instead of the config file will automatically apply the change without a game restart.

Additionally, the reimplemented stitcher also COMPLETELY replaces the vanilla stitcher, which makes atlas stitching a lot faster compared to whatever spaghetti code was originally doing that.

Special credit to Sciss for the MIT-licensed java rectangle packing code, i took that code as a base and improved upon it to achieve this.