Shortcut keys for quit client and connect input device.

[Mitteau]

For keyboard "aficionados"... two shortcuts, to exit client and to connect to the found crazyflie. Also better battery display including voltage values. It's useful to have more information on the status of the battery installed.

Shortcut keys for quit client and connect input device. Also:
Battery voltage shown in Main UI.
Adapt voltage limits for battery.

Modifications:
modified : src/cfclient/ui/main.py
modified : src/cfclient/ui/main.ui

[Mitteau]

I don't know how to modify the RFP. So I can't solve Travis error which is due to a too long line in the code... Do this commit interests you or do I close it?

[krichardsson]

Hi!

Nice functionality!
I would prefer to keep the caption of the button as it used to be though, and move the "Ctrl+I" part to the tool tip to be displayed when hovering over the button. If you add the shortcut to the "Connect to Crazyflie" menu item as well, it will be displayed in the menu and guide the user.

For the line that is too long (206 in main.py), just break the line after QShortcut(

        self.connect_input = QShortcut(
            "Ctrl+I", self.connectButton, self._connect)

[krichardsson]

Merged
Thanks!