Symbol widget: overlay color and fallback symbol properties #2194
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In an attempt to align the Symbol widget with the MultistateLED, I've added two widget properties, see also #2187:
The "disconnect overlay color" property can be used to customize the color of the overlay rectangle shown when PV is disconnected. As alpha is supported in the color picker, user may in practice disable the overlay.
The "fallback symbol" is used to define the symbol to use if PV assumes unmapped value. If not specified, the fallback symbol is the default symbol. This means that if user does not want any fallback symbol at all, a symbol file must be specified that essentially contains a transparent image.
