overlay toggling
fixing toggling for repeaters / transformer
cropped flag texture a bit
use a lovely image for visibility toggling instead of an ugly checkbox
Merge branch 'overlay_toggle'

Conflicts:
	FlagMaker/FlagMaker.csproj
	FlagMaker/Localization/strings.Designer.cs
	FlagMaker/Localization/strings.resx
	FlagMaker/Overlays/OverlayControl.xaml