Multiple installations:
- added a button to on/off the all the subwindow buttons
- added a button to delete all the subwindows and their indicators. Alternatively they can be deleted starting from last subwindow
- the indicator's name in the subwindow will be automatically inserted on the button and in the subwindow's name
- the button's name don't need to be changed anymore when reinstalling the indicator
- the button's position is managed as a group of button in the last subwindow installed

- Added the icon in the input
- Added the "NONE" option in the customization keys of keyboard
- Improved button ractivity

- Fix Bug related the the On Off shortcut keys

Fixed minor bugs.

- it has been improved the shortcut keys in the input