LÖVE 11 fixes

[qixils]

• [x] ~~Check for remaining conversions from isDirectory and fix them~~
• [x] ~~Disable letterboxing by default~~
• [x] ~~Fix Android scaling issue~~
• [x] ~~Fix color-sensitive slope tileset issues~~
• [x] ~~Fix color-sensitive debris tileset issues~~
• [x] ~~Update game icon to use modern mario palette~~
• [ ] Fix Luigi hat colors??
• [ ] Unchangeable character colors still??
• [ ] Also loading with incorrect colors. Affects highly custom characters like Kirby.
• [ ] Text color copying wrong colors
• [x] ~~pairs issues~~
• [ ] Audio quality regression?
• [x] ~~Dialog text defaults to black instead of white~~

  After looking at the code in dialogbox.lua (and testing the code snippet to make sure), it re-normalizes the default white color, which is already manually normalized