Blender Git Loki

Move File section into system group

And rename from "File" to "Files".

mainly fixing some warnings, further fix attempts for misbehavior with constraints/dynamic

Rename operator: "Save User Preferences" -> "Save Settings"

Move interface item back to top

Keymap: preference for extended shading menu

This brings back the option to have x-ray & overlay toggle.

Address review inline comments

Merge branch 'blender2.8' into userpref_redesign

Scale up layout & use icons for category groups

Icons were already prepared by @jendrzych. Thanks a lot!

Depsgraph: add a new operation node for computing B-Bone segments.

Computing the shape of a B-Bone is a quite expensive operation, and
there are multiple constraints that can access this information in
a variety of useful ways. This means computing the shape once per
bone and saving it is good for performance.

Since the shape may depend on the position of up to two other bones,
often in a "cyclic" manner, this computation has to be a separate
node with its own dependencies.

Reviewers: sergey

Differential Revision: https://developer.blender.org/D3975

GP: Apply alpha to mix color

Merge branch 'blender2.8' into greasepencil-object

fix: Collada: used wrong Enumeration type for comparison

fix: collada: must use case sensitive filename in include

GP: Exchange opacity and blend parameters in Panel

fix: Collada: use reference to BezTriple instead of copy

GP: Disable opacity of Blend layers

The opacity parameter is not logic for blend layers because the opacity is determined by underlying layers.

some more dynamic fracture stability fixes

fix: compiler errors on mac_x86_64_10_9

cleanup: Collada: remove unused variables

Pass viewport to BASE_ related tests, for viewport view/select restrictions

Note: functions like select all are still not respecting that.
I will fix this as part of the local view commit though.