Command + A shortcut support

[yasoob]

It is very unintuitive as a Mac user that the search bar does not support the command + A shortcut for selecting all text in the field. This support would be a nice addition to make the app feel more "native".

Otherwise, I am really impressed by the speed of Orange. Good work! :)

[yasoob]

And maybe add the "Command + Q" shortcut for closing the application.

[naaive]

Thanks, these shortcut will be added.