overlays: implement osk panels

[Megamouse]

• Refactors the overlay osk to use panels that can be switched out dynamically
• Fixes wrongly enabled control buttons (shift and layer/mode)
• Fix Full-Width alphabet, which could not be displayed before
• Uses L2 and R2 for switching between the panels
• Adds URL Panel
• Adds Password Panel (No *** yet)
• Adds Halfwidth Numeric Panel
• Adds Fullwidth Numeric Panel
• Adds Halfwidth Alphabet Panel
• Adds Fullwidth Alphabet Panel
• Adds Basic Japanese Panel (no dictionary)
• Adds Basic Hiragana Panel (no dictionary)
• Adds Basic Katakana Panel
• Adds English Panel
• Takes the osk panel modes passed by games into account and uses the system language by default
• Uses English Panel as Fallback for other languages

TODO:

• Add visual clues for current/available panels and L2/R2

[MsDarkLow]

Seems to be working properly.
Example of renaming a doggo to Morishita (モリシた) and to Mega (English) in Yakuza Ishin.
Morishita (モリシた)


Mega