Removed the GdkThread entirely since:
1. It seems unnecessary without the API calls.
2. It's deprecated - all Gtk/Gdk calls should be in the main thread anyway.
Also changed the references using the stock image to use the icon "MISSING_IMAGE" to eliminate those deprecation warnings.
1. Added argument for absolute path (with final slash) to nrsc5 if needed, defaults to no path. If absolute path to nrsc5 is required, can now invoke with:
`python3 nrsc5-dui.py /usr/local/bin/`
2. Added tooltips to ID3 info (title, artist, album, genre) in case it exceeds display limitations.
1. Changed ID3 data in Track Info to labels vice entry boxes.
2. Made all labels uniform with titles right-justified and ending with a colon, data labels left-justified.
3. Added a hand cursor to the stream info in the Station Info tab to signify they may be clicked.
1. Added back the connection to callbacks for the whole window to enable all of the controls. (bizarre)
2. Fixed animation, which wouldn't work without a valid list of maps to display - regex anticipated the path to start with the `map` directory instead of the whole path from root.
Fixed the way the images were displaying. The images may still be latent because of erratic station transmission, but the application will be able to properly display when it does. Also, station logos are now being properly cached in StationLogos.json
