This replaces the deprecated DrawData mechanism by the
usage of the update timestamp `last_update`.
The compositor keeps the `last_update` value of the cached ID
and compares it with the value on the ID at the time of evaluation.
Rel #134690
Pull Request: https://projects.blender.org/blender/blender/pulls/134878
By now it is just a "compositor", so move the files one folder up.
Things that were under realtime_compositor/intern move into
already existing intern folder.
Pull Request: https://projects.blender.org/blender/blender/pulls/132004
