Keyboard

- set_keyboard_*.sh renamed to keyboard_*.sh.
Windows closing

- Windows are closed on middle click to window title.
- Buttons behavior documented.
Keys and shortcuts

- New terminal is executed on Pause.
- KSnapShot is executed on PrintScreen.
- Run program window is shown on Alt+F2.
- Sound volume is decreased/increased on Shift+F11/Shift+F12 with OSD notification.
Submenu is shown on mouse hover
Lock screen on Win+L