4.20.1 - Refactor GUI apps and UC Mode

Refactor GUI apps and UC Mode

• Refactor GUI apps
  --> This resolves #2179
  --> This resolves #2177
• Refactor UC Mode
  --> This resolves #2176

What's Changed

• Refactor GUI apps and UC Mode by @mdmintz in #2180

Full Changelog: v4.20.0...v4.20.1