Minimize main window to tray with icon, tooltip, and menu

When the main window is minimized, create a tray entry and hide the window from the taskbar.

Used `global.pkg.window` icon and title for the tray's icon and title/tooltip.

Created a tray menu with options to open the app, start all servers, stop all servers, and quit.

Related: https://github.com/coreybutler/fenix/issues/22