MiniVideoRecorder: Create Actions for starting/stopping video recording, and capturing the current video frame

[ES-Alexander]

We should support controlling video recording and image capture from the joystick.

Builds upon #609. Creating Actions from the widget itself makes it possible for the actions to be listed per widget instance, in a similar way to how the VeryGenericIndicator splits out different messages of the same type by their differentiator/ID field.

Base idea suggested by BillyBud in this forum comment.

[rafaellehmkuhl]

Cool.

To start, we could just use the stream that is already selected, and for the future, we could open a modal that allows selection of the stream with the joystick itself (with the arrows, for example).