Blender Git Loki

Use VectorSet instead of vector for def_group.

The lookups are now faster and insertion order is also
retained since no item is removed from the `VectorSet`.

Also fix a leak that happened due to mishandling of the pointer
to the allocated memory of `MDeformWeight`.

Remove potentially confusing loop index that is used with
`tot_loop_idx`.

Revert "Merge remote-tracking branch 'DarkdefenderRepo/npr_tess_2_90' into lanpr-under-gp"

This reverts commit ceb3b7098c112564ae88bc21b0efbea57f757e6d, reversing
changes made to ef2189542d3d4158cf08bd1fd8185d89356fb01a.

Outliner: Fix dragdrop insert not working for childless elements

Childless elements are flagged as open, so sorting after does not work.
An additional check to see if there are any children is neded.

Merge branch 'master' into soc-2020-outliner

GPencil: Basic path exported

Still pending perimter, materials and center in the document.

Turn off debug file writing in boolean etc unit tests.

Also, for Windows, do something other than /tmp when file writing
is turned on. This file writing is only intended for debugging.

GPU: Vulkan: Add creator arg to enable vulkan drawing

The creator arg is meant to support more than vulkan or opengl.

This currently fails because there is no GPU backend separation.

Note that we use G.debug with a debug flag to know what context type to
create. This will need to be cleaned later.

GPencil: Basic structure of layers

The problem was the Region was NULL, but now using a function the region is right.

Cleanup: silence clang-tidy warnings; comments.

Use static_cast wherever applicable.

Pass struct by reference.

Remove unnecessary const qualifiers for primitive types.

Make some member functions static instead.

Remove intermediate non-owning pointers to new class instances.

Remove else in else-after-return.

Initialise variables at definition.

Fluid: Added an option for color mapping pressure grid

GHOST: Vulkan: Support window resizing

GPencil: WIP delete curve points

GHOST: Vulkan: Style Cleanup

GHOST: Vulkan: Better debug messages

Merge remote-tracking branch 'DarkdefenderRepo/npr_tess_2_90' into lanpr-under-gp

GHOST: Vulkan: Remove swap interval functions

Keep vertex deform group names and def_nr in sync

I realised later on that Map is unordered, so the order of insertion,
on which def_nr depends, is not retained. So a Vector of strings
has been used & the index of the string-of-interest is the def_nr.

Unfortunately, it will be slow on large number of vertex groups.

Cleanup make function private

Fix memory leak

GHOST: Vulkan: Add Test command buffers and sync primitives