Key bindings for info popup

[Aloso]

Currently it's impossible to open or close the info popup in fullscreen mode, so I suggest adding the following features:

• Allow binding a keyboard shortcut for the info popup
• Close the info dialog when pressing Escape or when clicking outside of the popup

[ArturKovacs]

This could be bound to F1 by default.

[ArturKovacs]

Does F1 conflict with a system wide shortcut in any desktop environment?

[Aloso]

Not that I know of. On KDE, F1 is the default shortcut for help, so this is fine.