LANPR: Fix memory leak due to missing LANPR compiler flag in BKE.

LANPR: Fix ortho mode view direction.

Merge remote-tracking branch 'origin/master' into temp-lanpr-cleanup2

LANPR: Removed chaining thresholds from when using LANPR engine.

The value is only effective in grease pencil conversion.

Cleanup: float value format in rna_scene.c

LANPR: Remove unused property.

Merge remote-tracking branch 'origin/master' into temp-lanpr-cleanup2

LANPR: Ortho camera live update support for viewport.

Note: Incorrect view direction leads to incorrect contour in ortho
viewport, in render mode both ortho and perspective is working.

Merge remote-tracking branch 'origin/master' into temp-lanpr-cleanup2

VSE: open file browser sidebar by default when adding external strips

Open the file browser sidebar by default when adding Movie/Sound/Image Sequence Strips, to show the operator options.

Differential Revision: https://developer.blender.org/D6212

Reviewed by: William Reynish, Julian Eisel

Fix T71474: Temporary image editor cancels to file editor after file operation

Fix T71194: UV Face centers wrong location with sub-surface mesh

Fix T55632: USE_DRAG_MULTINUM and USE_ALLSELECT not working well together

'is_copy' was not set correctly on all uiButMultiState (it was done once
for uiHandleButtonData), resulting in 'delta' being used on some indices
of the array and not others in `ui_selectcontext_apply`.

Maniphest Tasks: T55632

Differential Revision: https://developer.blender.org/D6201

Fix tool leader-key consuming mouse wheel events

Fix T66124: Gizmo orientation doesn't refresh when making face

Fix T71414: Undoing change of lattice resolution deforms mesh

Fix T70778: Library Override dissabled after re-instancing same collection in different scene.

Very stupid mistake in own new generic ID lib_link function, that would try
to link ID pointers for all data-blocks, not only those actually needing it.

Fix dyntopo sculpt not setting vertex indices dirty

This is an old bug exposed by new cursor drawing
which uses vertex indices.

Stretch To: implement a mode similar to Damped Track for rotation.

Most of the time Stretch To is used in actual rigs, like BlenRig
or Rigify, in combination with Damped Track to handle rotation
before the stretch, because it produces rotations more appropriate
for organic deformation, and doesn't flip because of internal
gimbal lock.

The prevalence of this pattern suggests that Stretch To should
support that kind of rotation directly as an option.

Differential Revision: https://developer.blender.org/D6134

EditMesh: avoid undo push on face creation if no action is made