Proper UI Scaling for odd screen sizes

[likeich]

Ensure UI scales properly with different screen sizes. This is mostly an issue with tablets, small devices like the Pocket DMG, and large devices like TVs and Samsung DEX.

App Drawer

• Scale sidebar based on a % of the screen.
• Scale the close button to fill the max width while maintaining a normal height.
• Scale the keyboard grid to arbitrarily fill whatever space it has.

Settings Menu

• Scale settings sidebar based on screen size percentage.
• Consider replacing the sidebar with a single column of icons on very small screens (Pocket DMG).
• Scale toggle button text and icons in the sidebar (ConstraintLayout?).
• Fix dock toggles overlapping on small screens (Pocket DMG).