overlay selector - preliminary stuff / prototype
fully-operational selector dialog (so far)
converting crescent to path
overlay button tooltip
Merge branch 'master' into overlay_selector

Conflicts:
	FlagMaker/Overlays/OverlayControl.xaml.cs
back to box as default
fixing a few final bugs, adding Escape-to-close
some error handling, just in case
Merge branch 'overlay_selector'

Conflicts:
	FlagMaker/Presets/comoros.flag
	FlagMaker/Presets/westernsahara.flag
	FlagMaker/readme.htm