[MC UPGRADE] Changed all code to be compatible with MC 1.6.2
[Improvement] Changed annotation for inventory tweaks
[Improvement] better rendering of the model to prevent flickering
[BugFix] backpacks now rotate properly when the player sneaks
[Improvement] Better positioning of gui and gui elements
[BugFix] backpacks now properly reduce the damage like leather armor
[CleanUp] code cleanup v1.12.15