Blender Git Loki

Draw info editor buttons in topbar

Basically copies most of the UI definitions from info editor to top bar.

Create global areas for all non-temp windows

Get rid of hardcoded screen-size calculation

Screen size is the rectangle that can be used by screen layouts, so it
excludes global areas.

Merge branch 'workspaces' into topbar

Conflicts:
source/blender/blenloader/intern/readfile.h
source/blender/blenloader/intern/versioning_280.c

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Support render layer per workspace

We decided to keep workspace and scene render layer separate for now,
but in future they'll probably be either unified or there are going to
be ways to sync them.

Merge branch 'blender2.8' into workspaces

Conflicts:
source/blender/makesrna/intern/rna_space.c

Merge remote-tracking branch 'origin/blender2.8' into workspaces

Merge branch 'workspaces' into topbar

Merge branch 'blender2.8' into workspaces

Conflicts:
source/blender/editors/workspace/glutil.c
source/blender/gpu/intern/gpu_framebuffer.c

OpenGL: wm_gesture uses new imm mode

D2376 by @ianwill, part of T49043
review by @merwin

Box select, circle select, etc. Introducing the dashed-line shader! See D2376 for more info.

Opengl glaDrawPixels removal: More descriptive setup.

OpenColorIO: Update glsl implementation to be ready for ogl 3.3 core

Fix break in drawscredge_area_draw when in fullscreen

Add immDrawBorderCorners function

This replaces `glaDrawBorderCorners`.

OpenGl immediate mode: drawnode.c

Part of T49043