PMMO Skills Screen Hotkey

Adds a keybind that opens/closes PMMO skills screen. Default key is R.

• Code written by AI, no issues found
• Tested on pmmo-1.20.1-1.7.38 and pmmo-1.20.1-1.2.20
• Keybind can be changed in Minecraft Key Binds menu
• Mainy for people that use Inventorio and PMMO