Blender Git Loki

Build: require C11/C++11 for all operating systems in master.

This is in preparation of upgrading our library dependencies, some of which
need C++11. We already use C++11 in blender2.8 and for Windows and macOS, so
this just affects Linux.

On many distributions this will not require any changes, on some
install_deps.sh will need to be run again to rebuild libraries.

Differential Revision: https://developer.blender.org/D3568

Silencing a bunch of compiler warnings

Most of these were mismatched const qualifiers

Cleanup/Refactor: Move CurveCache runtime data into Object.runtime struct.

Also, fix missing cleanup of Object.runtime when copying Object
datablocks!

Workbench: Use FXAA instead of TAA when viewport is animated.

Fix T55996 "Playback in "Active Editor Only" doesn't work"

Cycles: Fixed OpenCL build. sqr(float4) is available on CUDA and CPU, but not on OpenCL.

Fix T56020: Crash while opening .blend file made with older version.

We need a NULL workspace check here, in some cases we get a SRTemp
screen even though it's not tagged as temp...

UI: Hide labels from MatCaps

They were added as placeholder to show something until they lazy-load.
But since the load is fast and it's hard to fit the text, and their name
is displayed already in the tooltip, we can do without for now.

In the future when we have insta-tooltips we should make them use this.

Motion Path: Don't blit MSAA buffer if there is no motion paths

Armature: Fix bone always transparent when enabling MSAA

Motion Path: Fix motion path when MSAA is enabled

DRW: Add option to only resolve framebuffer colors without depth test

DRW: Add DRW_shgroup_is_empty and DRW_pass_is_empty

Viewport: add new default set of matcaps.

These were made by the community and curated by Pablo and William.
Thanks to everyone who contributed!
https://devtalk.blender.org/t/call-for-content-matcaps/737

Command used for compression:
oiiotool %s --ch R,G,B -d half --compression dwab -o output/%s

Shape keys: change default interpolation for absolute shape keys to linear.

Fix T56121 and maybe others: DST.gpu_context was being created in the wrong DST.gl_context.

In addition to the crash in the selection of bones, this was responsible for other problems such as wrong hair and disappearing objects.

Fix T56152: Rotate crash w/ individual origins

Merge branch 'master' into blender2.8

Sequencer: move text & color into own category

Add 'Generate' menu, these aren't effects from a user perspective.

D3546 by @rudolf.ortner

Merge branch 'master' into blender2.8

Cleanup: id-property creation

D3473 by @JacquesLucke