[Xastir] Different symbols for symbols with overlays

[Eric Christensen]

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Does Xastir support the ability to display a different symbol based on
the overlay transmitted?  It appears that Bob's vision (as described in
the Overlay section of http://www.aprs.org/symbols.html) is to display a
different symbol for certain symbol/overlay combinations.

If Xastir can currently do this I can start working on some of the
symbols.

73,
Eric WG3K
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