Migrate UI to Jetpack Compose

[ivancea]

Things to migrate:

• [x] Rules list
• [x] Dark theme
• [x] Light theme
• [x] Check change themes
• [x] Click rule
• [x] Click glossary
• [x] Show symbols (Check settings reload)
• [x] Search highlight
• [x] Format examples
• [x] Long-press options:
  • [x] Copy
  • [x] Share
  • [x] Read
  • [x] Search in rule
  • [ ] Bug: Center menu in screen, or show below long press
• [x] Scroll to rule on navigation
• [x] Do not link subtitle rules
• [x] Highlight/Focus navigated rule. Click effect?
• [x] About dialog
• [x] Top bar menu
  • [x] Title
  • [x] Search
  • [x] Expand
  • [x] Suggestions
  • [ ] Suggestions overlapping keyboard in free keyboard mode, not being shown if keyboard is static in landscape mode
  • [x] Home icon
  • [x] Dropdown
  • [x] Random rule
  • [x] Change rules
  • [x] Change theme
  • [x] Show symbols
  • [x] Compare rules
    • [x] Compare rules dialog
  • [x] About

Special checks:

• [x] Check rules comparator view
• [x] Check About popup works well while trying to remove it clicking on a rule in background (Bug?)