[1.21.0] UI rework & docs browser

[1.21.0]

• Added the docs browser for quick Geode documentation access
• Added styling to the audio element in the sprite browser
• Added support for multiple sheet tabs being open at once
• Added better music controls
• Replaced sharp with jimp for more stability
• Reworked the UI system to use more native solutions
• Improved resource caching
• Added better tabstop support in sprite browser snippets
• Fixed several race conditions
• Fixed font alignment
• Fixed missing font characters
• Fixed cached paths persisting when the file no longer exists
• Fixed snippets missing quotes
• Fixed random sprites showing up in the sprite browser due to false positives
• Fixed audio elements scaling incorrectly
• Cleaned up dependencies