The 'operator' property was added to gstframepositioner so that
blending modes in the compositor could be accessed. This was done
by accessing the pad of the compositor class, and referencing the
'operator' property in that pad. Getters and Setters were also
created so that the 'operator' could be accessed by software that
is based on GES, such as Pitivi.
Related to but does not close Issue
https://gitlab.gnome.org/GNOME/pitivi/-/issues/2313
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/236>
Avoid loosing (too much) precision when rescaling back and forth by
storing values in gdoubles.
Handle the fact that position values can be negative
Also fix debug category static variable
as it clashes with the instance variable name in a few methods.
We try to do our best to have the video frames scaled the best way
to fill most space on the final frames, keeping aspect ratio. The user
can later on rescale or move the sources as usual but it makes the
default behaviour a better and more natural especially now that we
set default restriction caps to the video tracks.
And fix the unit test to take that change into account
