Chess Clock - Game Timer & Sta

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- Auto hide navigation bar on devices with software navigation buttons.
- New setting for playing low time warning only once.
- Refreshed app icon.
- General improvements and optimizations.

=== Previous updates ===
- Added a 'Touch response' gesture setting to handle multi-touch events (when both players have hands on clock).
- Display name of players on clock.
- Choice of fonts to customize clock.
- Configurable low time warning.
- Possibility to adjust clock time through bonus/penalties.