Blender Git Loki

MCE: Mask tool improvements

The mask tool now respects the settings for new handle_type in the tool
settings for new points. This makes it work more like a proper tool.

However, now it does not use the active point anymore as a reference for the handle_type
settings of new points as it was until 2.93.
So e.g. if the user starts to draw a mask with handle_type Auto and
changes the active point to Vector, every new point
drawn with the mask tool will still have handle_type Auto. Overall I
think the new behavior is better though.
Also, the user does not need to keep Ctrl pressed to draw a mask.
Instead, the tool will draw a mask point on every click, unless the mouse
is close to an existing point, then it will work like the tweak tool.

The user can hold down Ctrl to activate the add_feather_vertex_slide
tool.

Cleanup, remove unused enumeration

Fix wrong array bound used for loop

Cleanup, use GPU_VERTBUF_DISCARD_SAFE

Properly compute vertex normals when limit surface is not available, fix
loop normals computation.

Add a function to construct a VertexFormat for a buffer containing indices

Cleanup: Added comment to clarify limitation of undo implementation

GPencil: More work with transformations

Merge branch 'master' into asset-greasepencil

GPencil: When click outside the area, the action is confirmed

Merge remote-tracking branch 'origin/master' into temp-lineart-contained

Merge branch 'tracking_tools' of git.blender.org:blender into tracking_tools

MCE: Always use mask preset for new vertex.

This is more a test, but this change makes it so that a new vertex uses
the mask tool setting for a new vertex. Not sure if this is the desired
behavior though, because before you could change the handle_type of the
active point and then every point extruded from it would use the new
handle_type.

Merge branch 'master' into subdivision_work

Merge branch 'master' into soc-2021-curve-fillet

USD importer format fixes.

USD importer: includes cleanup.

Removed unused includes and reordered includes.

USD import: remove unused includes.

USDNurbsReader: update comment.

Updated comment and replaced commented out code with
#if 0 block.

Merge branch 'master' into curve-nodes-modifier