- updated the requirements.txt file to request that the Shapely package needs to be at least version 1.7.0 as it is needed in the latest versions of FlatCAM beta
- some TOOD cleanups
- minor changes
- added a 'Close' menu entry in the Tcl Shell context menu that will close (hide) the Tcl Shell Dock widget
- on launching the Tcl Shell the Edit line will take focus immediately
- in App.on_mouse_move_over_plot() method no longer will be done a setFocus() on every move, only when it is needed