Dinghy Sailing Race Control

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Experimental - Add graphic file types to FileExplorer code, so they show up in Results.
PDFRenderer - .png selected as default.

Series results - 'Count back' code now included to address tied scores.
Race - Big fix for fleet selection in Competitor/Race views when there are fleets defined but in Single start mode.
Everywhere - SAF used for import where API>29.