Customizable Player Models

Increased the MCScale limit to 48 (Closes #610)
Added on option to turn off the update checker (Closes #611)
New keybinds: (#620)

• animation previous and next frame
• reload texture

Updated Spanish translations (#606)
Scaling changes:

• All scaling settings must be enabled by the server admin
• This changes: Entity Scaling, Eye Height and Hitbox Scaling
• These options were enabled by default in previous versions

1.21 PreRelease 2 port
Pehkui Support on 1.20.6

Fixed enchanted armor on 1.2.5-1.12 (Closes #617)
Fixed editor unable to open projects on 1.2.5
Fixed wiki reader images not loading
Fixed wiki and changelog reader not parsing markdown correctly (Closes #590)
Fixed additive fixer not applying to roots
Fixed tag editor not working (Closes #609)
Fixed GL exception on 1.8 with above head error messages
Fixed experimental exporter not loading layer animations correctly
Fixed scaling settings resetting when dying
Fixed enabling single texture and per-face UV breaking the cube