Blender Git Loki

GPencil: Fix add needed gpd reference

GPencil: Add corner angle parameter

This parameter allows the user to control at what angle corners are
detected and considered by the fitting algorithm.

GPencil: Cleanup int types to uint

GPencil: Cleanup some variable types

GPencil: Fix error and warnings after merge

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-edit-curve

Use DrawManager for Image/UV Editor

This project moves the current UV/Image editor drawing to the draw manager. Why would we do this:
**Performance**:
- current implementation would draw each texel per time. Multiple texels could be drawn per pixel what would overwrite the previous result. You can notice this when working with large textures.
- repeat image drawing made this visible by drawing for a small period of time and stop drawing the rest.

**Alpha drawing**:
Current implementation would draw directly in display space. Giving incorrect results when displaying alpha transparent images.
Old:
{F8780114}

New:
{F8780113}

This addresses {T52680}

**Current Limitations**
- The project can be activated in the user preferences as experimental features. When support of huge textures is implemented we can switch over.
- Using images that are larger than supported by your GPU are resized (larger than 16000x16000). This leaves some blurring artifacts. We want to solve this after this patch has been reviewed and committed. Users will notice that the image is blurred a bit when zoomed in and looking at actual pixels.

**TODO**
* [ ] drawing of image unavailable grid. Need to check the use case for the current grid thing.
* [x] drawing of masking + render info etc.
* [ ] painting does not update the GPU textures.

**Future**
* Use smaller GPU textures when zoomed in.
* Support huge texture sizes.
* Migrate mask drawing to draw manager.

Maniphest Tasks: T67530

Differential Revision: https://developer.blender.org/D8234

Merge remote-tracking branch 'origin/master' into lanpr-under-gp

# Conflicts:
# source/blender/blenloader/intern/versioning_280.c

Outliner: Move view layer tree left when mode col is disabled

Merge branch 'soc-2020-custom-menus' of git.blender.org:blender into soc-2020-custom-menus

tetgen flag default off

Collections: Show icons in search menus

Show in Object Properties > Instancing > Collection and elsewhere.

Remove the link icon in UI_collection_color_icon_get because the link is
redundant in that menu.

Collections: Use filled collection icon in menus

After using colored icons in menus, use normal icon for non-tagged
collections for consistency.

Outliner: Simplify collection drop tooltip

Rather than specifying after/before/between for collection reorder, just
use "Reorder collection(s)" similar to object reorder.

Outliner: Add new row children filter

Add a new filter to prevent the drawing of row icons.

Fix T79790: GPencil sculpt strength icon changed in recent cleanup

This commit restores the vertex colors which were lost in the cleanup.

Merge branch 'blender-v2.90-release'

UI: Fix type in multires modifier subpanel

Thanks to @zanqdo for reporting "Subdivions"

Also remove the empty space I left for the "Delete Lower" operator that
never made it into 2.90.

Cycles: Fixed small light tree volume bug