Blender Git Loki

Support importing vertex deform groups.

Remove unnecessary casting in exporter's deform group related code.

The fix in `BKE_object_deform.h` is temporary, until D8378
is committed to master.

GPencil: reorganize code

Prepare to have more exporter types

Particles: simulate partial time steps on newly emitted particles

Particles: spawn particles on mesh surface

Fix build errors due to wrong auto to type changes

They were the last changes I made and didn't build afterwards.

Custom Menus : Add keymap

Merge branch 'blender-v2.90-release'

Fix T79187: Outliner "Make Single User" crash

When "ID Data" -> "Make Single User" is chosen with selected elements
that are not curves, there is a crash. This fix ensures that the id in the
callback function is an Action.

GPencil: Basic creation of XML

All parts in place, ready to start to create the export

GPencil: Implement curve points dissolve

UI: Use an operator to set the property editor's pinned data-block

This is another change pulled from the `property-search-ui` branch. This is useful
because it means the pin button doesn't have to be a custom button defined in C.

Replacing the use of button callbacks with operators is always nice too.

Differential Revision: https://developer.blender.org/D8376

Use operator to toggle pin data-block

Merge branch 'blender-v2.90-release'

Fix: Incorrect VR pose after changing landmark

Once the base pose was changed (e.g. by changing the active landmark), we'd always run the logic to reset to the base pose. That would mess up the final viewer pose.
Think this only got exposed through 607d745a79e0.

Cleanup: Fix typo in comments.

Cleanup: unify naming between different spans

Move Object creation code in Mesh creation class.

This is required for setting deform groups which are a part of `Object` struct.

Also rename NurbsElem > OBJNurbsElem.

Remove forward declarations from *nurbs.hh & *mesh.hh files
since the cyclic dependency with *object.hh is removed.

Remove auto.

GPencil: Fix unreported missing frames in interpolation

When interpolate, the temp frames are tagged, and later removed. If for any reason any stroke was tagged in other area of Blender (this tag is used for temp tagging), the stroke could be removed by error when run interpolation.

In a previous fix, the tag was cleared before, but only for the frame range of the interpolation. Now, the clear is done for all frames.

Also, instead to clear for each stroke sampling, now it's done only once at invoke time.

Particles: improve mesh emitter

Particles are now emitted from vertices of the mesh.

GPencil: Fix compiler warnings