Add manual mower control actions in AreaRecording mode

[olliewalsh]

Previously users would call mower_comms setMowEnabled directly to enable the mower while in AreaRecording mode. However this should not have been possible since AreaRecording::mower_enabled() always returned false.

mower_logic now confirms that the mower state is as expected, so bypassing it in this way no longer works.

Add actions to toggle AreaRecording::mower_enabled() instead.