Create styling for game board

[decarbonization]

• [x] Game board background
• [x] Pie background
• [x] Pie pieces (three possible colors, 6 segments in total)
• [x] Timer
• [x] Special actions
  • [x] 2x multiplier
  • [x] destroy all pieces
  • [x] slow down timer
• [ ] Game controls (Can probably just be a tintable button style)
  • [ ] New game
  • [ ] Pause game
  • [ ] Resume game
  • [ ] End game
  • [ ] Settings
  • [ ] Help / Tutorial