Add basic animations to game board

[decarbonization]

• [ ] New piece available
• [x] Placement of pieces -- piece moves into place (https://github.com/decarbonization/android-fonz/commit/16265132a7417fa5c95ffd9966692880bc2df343)
• [ ] Pie completed with different colors -- pieces disappear one at a time
• [ ] Pie completed with same color -- pies all disappear together, possibly with a flash
• [ ] Game started
• [ ] Game ended