feat: code documentation phase 1

[Local9]

Committing due to the number of fixes contained within

• Initial code documentation phase, still more to be done
• Transitions work for Big Message
• Fix to "GoLeft" for Sliders and Percentage items
• Fix duplicated file for SettingsSliderItem.lua due to case sensitivity
• General fixes across the code from Copy/Paste errors

[manups4e]

i see there's still some work to be done you want to merge it as Part1? edit: i didn't read the title.. 🤦