6b3a4cbf46
Remove all traces in the source code of the never-properly-implemented
'Python' F-Curve modifier type. It was introduced in 44e5b7788b.
This modifier was never coded to completion, couldn't be created, didn't
have a GUI, and probably would have caused severe performance issues if
it were ever implemented.
Not only that, but the modifier had space for custom properties
(IDProperties), which means that it could point to any ID. This in turn
means that `bke::action_foreach_id()` would have to loop over every
F-Curve and every F-Curve modifier to handle such relations. By removing
this modifier type, that loop can also be removed from that function.
Note that F-Curves can only refer to other IDs when they are used as a
driver. However, the F-Curves stored in an Action as animation data are
never drivers.
`BKE_fcurve_foreach_id()` is now only relevant when the F-Curve is a
driver, which I've added to its documentation.
The enum entry `FMODIFIER_TYPE_FILTER` in `DNA_anim_types.h` is kept, so
that it's clear that this once existed (which explains what would
otherwise be a hole in the values of the enum entries).
No functional changes should be observable by Blender users, as this
feature doesn't seem to have ever existed in a way that could be used.
Pull Request: https://projects.blender.org/blender/blender/pulls/123906
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