Fix T75250: setting greasepencil active layer not refreshing the dopesheet

This was only reported for the 'Change Active Layer' operator [which was
not setting the channel as selected in the dopesheet], but this is also
the case elsewhere [where BKE_gpencil_layer_active_set is used], namely:
- gp_layer_remove_exec
- gp_layer_copy_exec
- gp_merge_layer_exec
- gp_layer_change_exec
- gp_layer_active_exec
- gp_stroke_separate_exec

We could set GP_LAYER_SELECT "by hand" in
BKE_gpencil_layer_active_set(), but there is already
animchan_sync_gplayer() that does that. For this, we need the
NA_SELECTED notifier though.

Maniphest Tasks: T75250

Differential Revision: https://developer.blender.org/D7311

Cleanup: typo in comment

Fix T75315: typo in automasking UI text

Fix T66494: Alt+ clicking (assign to all selected) does not work for NLA
strips

This uses the new "selected_nla_strips" context member in
UI_context_copy_to_selected_list().

bonus: this also makes the "Copy To Selected" button operator [in the
button context menu] work for anything NLA Strip related.

Maniphest Tasks: T66494

Differential Revision: https://developer.blender.org/D7281

Add a "selected_nla_strips" context member

Needed for upcomming fix for T66494.

ref T66494 / D7281

Fix T75234: Saving UDIM tiled texture as OpenEXR saves only the first
tile

This happened when the UDIM tiled image needed to be colormanaged, so
- when you set up the image as sRGB, then save as EXR/HDR/...
- other way around as well: when you set up the images as Linear then
save as PNG/JPG/...

Reason being that for UDIM tiled images, `image_save_single` is called
multiple times [once for each tile] and everytime `image_save_post` will
fire the `IMA_SIGNAL_COLORMANAGE` signal which clears the cache if any of
the above two is the case. Without the cache, the next tiles cannot be
saved.

Now determine if the colorspace changed from
`image_save_single`/'image_save_post' and only fire
IMA_SIGNAL_COLORMANAGE once from BKE_image_save in the end.
(thx @brecht for suggesting this alternative to the original fix)

Maniphest Tasks: T75234

Differential Revision: https://developer.blender.org/D7296

Cleanup: Remove debug print

Leftover from rB3b59c111821b.

Fix T69060: File Output Node does not work with Time Remapping

Problem is that the RenderEngines will change the RenderData cfra when
rendering (when time remapping is used -- at least workbench/eevee/
gpencil do a combination of BKE_scene_frame_get() plus
RE_GetCameraWindow() which alters the RenderData cfra).

Later on in the pipeline, the Compositor will use this RenderData cfra
to determine the output file name for the FileOutput node. (In contrast
to this, the 'regular' Output will use the Scene's RenderData -- not the
Render's -- cfra [which hasnt been altered])

It is not entirely clear why RE_GetCameraWindow was setting the cfra on
the Render, but it appears to be legacy OGL rendering related and is not
needed anymore.
Removing this will keep the cfra as needed for the Compositor FileOutput
node.

Fix T74927: Slow playback using Auto Normalization

Caused by rBedb3b7a323a1.

Using evaluate_fcurve_only_curve actually causes quite a bit of slowdown
[6x] compared to bezier forward differencing [which was used prior to
rBedb3b7a323a1]. But full fcurve evaluation is desired with Dynamic
Interpolation Effects [Back/Elastic] since their min/max will not be
captured with forward differencing.

So now gain back speed [using bezier forward differencing] and only do
the full fcurve evaluation for dynamic interpolation effects.

Maniphest Tasks: T74927

Differential Revision: https://developer.blender.org/D7196

Fix T58439: Info Editor does not show operator reports immediately when
operator cancelled.

Lots of operators return OPERATOR_CANCELLED when no data really changed.
Reports from those operators do not show immediately in the Info Editor
[they only do if the operator returns OPERATOR_FINISHED].

Now also notify the Info Editor in case of OPERATOR_CANCELLED.

Maniphest Tasks: T58439

Differential Revision: https://developer.blender.org/D7238