Dinghy Sailing Race Control

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- BT External - Prep Down and Race Starts changed to be in line with RRS

- BT External - Added short horn duration control

- BT External - Horn durations brought in line with RRS

- Experimental - 'additional voice prompts'

- Optional HTML output

- HTML used for interval review of results for those devices that cannot handle PDF

- Bug fixes - Final positions, WiFi light command, BT status icon