option to disable system tray icon

[bdantas]

The application works so well that I never have to change any settings or interact with it, making the system tray icon superfluous.

Please create a GUI option or command line flag that starts the application without a system tray icon.

(Currently the only way to hide the icon is to comment-out the s.show() call on line #110 in file src/main.cpp then recompile)