Top view control

In the top view in Developer Camera mode it would be very useful to have the
possibility to vary the orientation of the view in the 360 ° with the help of
a reference to a compass / protractor. however it is now only possible with
keys 4 and 6 on the numeric keypad with no control on fine variations (for
example ctrl + 4/6 for variations of 5 ° at a time shift +4/5 for variations
of 1 ° or a key that shows the view in reference to the geographic North or
rather to the magnetic one in the work area.