Customizable Player Models

Added moving per-face UVs and Animated Textures with Move UV tool
Added clear all function to the Clear button under Animations

Fixed cloning not working in some cases
Fixed non-additive animations not displaying correctly in the Editor in rare cases
Fixed some changes not updating the editor (Closes #263)
Fixed multi-selection not working with Move UV tool
Fixed LAN not working on some versions (Closes #260)
Disabled vanilla helmet 2nd layers (Closes #189)
Fixed rendering issue with Quark on 1.12.2 (Closes #244)