Customizable Player Models

CPM update to 23w13a_or_b
Entity Scaling works on vanilla without Pehkui.
Fixed mixin crash on startup

Added pehkui and vivecraft support on 1.19.4
Fixed crash on 1.8.9 (Closes #399)

Fixed crash on 1.19.4 (Closes #397)
Fixed crash on 1.7.10 (Closes #393)
Fixed essential breaking armor on 1.8.9 and 1.12.2 (Closes #362)