Warning icons don't show up on Windows

[ThomasJClark]

This may be behind some of the mysterious "camera sources not working" problems on Windows. The exception button uses fontawesome, which doesn't work on windows.

This should be fixed to use a .png image ASAP so people can actually see errors.

[JLLeitschuh]

Or we could include font awesome manually so that its not downloaded from the server every time. That way it will always be present.
http://controlsfx.bitbucket.org/org/controlsfx/glyphfont/FontAwesome.html

See related bug:
https://bitbucket.org/controlsfx/controlsfx/issues/588/fontawesome-requires-network-access