Chess Clock - Game Timer & Sta

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- Option to show tenth of seconds on last 20 seconds.
- Simpler game resume after pause with new resume button.
- General optimizations and improvements.

=== previous updates ===
- Choice of fonts to customize clock.
- In app purchase for ads removal.
- Better management of multi-touch events (when both players have hands on clock) with touch response gesture setting.
- Configurable low time warning.
- Clock adjustment through bonus/penalty after game started.