Since its introduction in rB5c569d227b64: patch [#35928] View roll operator from Kevin Mackay (yakca), with my own…, the view roll was based on
horizontal movement only. Using a "real" angle not only feels more
natural but also has the benefit of getting more precission the further
away from the center you are (just like regular rotation, brush/stencil
rotation etc.). A similar thing has already been implemented in the
Grease Pencil Tools Addon, now make the blender standard roll the same.

Since this is not using the transform system, we are still lacking a
line in the viewport (this could be added but since this is always based
on the center of the view we dont necessarily need this), as well as the
additional Shift-extra-precission behavior.

This also adds the ability to cancel out of the roll using ESC or RMB
(which is not common for viewops -- but makes sense in the case of roll
I think). This resets the view as well as potential locked cameras to
the original orientations (but does not remove potential autokeys --
which no transform does on cancel btw.)

Fixes T89883