Features
- MainActivity: synchronize animation with the software keyboard #2052 (WhiredPlanck)
- TestInputPanel: add fade-out animation for dismiss #2052 (WhiredPlanck)
Bug Fixes
- ensure input views aren't obscured by system UI bottom elements #2053 (WhiredPlanck)
Code Refactoring
- renew TestInputPanel background #2052 (WhiredPlanck)