Blender Git Loki

ObjectMode: Fix Outlines being drawn for BBox meshes

ObjectMode: Fix instances with BoundBox drawtype not displaying

Shrinkwrap: implement the use of smooth normals in constraint & modifier.

- Use smooth normals to displace in Above Surface mode.
- Add an option to align an axis to the normal in the constraint.

I've seen people request the alignment feature, and it seems useful.
For the actual aligning I use the damped track logic.

In order to conveniently keep mesh data needed for normal
computation together, a new data structure is introduced.

Reviewers: mont29

Differential Revision: https://developer.blender.org/D3762

Merge branch 'master' into blender2.8

Conflicts:
source/blender/blenkernel/BKE_global.h
source/blender/editors/undo/ed_undo.c

DEBUG_IO: add sanity check on libdata in undo step as well.

There are serious suspicions that weird corruptions faced by studio
artists may happen in undo/redo code, so let's see whether that's the
case.

With this, and when --debug-io arg is passed on startup, the whole lib
data are checked at every undo. This makes undo slower (from two to
three times slower), but it could help us spot better what happens...

Expose 'debug_io' flag in bpy.app

Minor style cleanup.

Dope Sheet: fix assert in new hold code when bezier keys are not sorted.

Turns out this can happen during duplicate+drag operations.

Fix T57096: Crash when scaling bones

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D3777

Cleanup: remove some #if 0 blocks

Reviewers: brecht, campbellbarton

Differential Revision: https://developer.blender.org/D3802

Eevee: Fix error when using texture coordinate on world shaders

Compilation errors were happening on OSX with errors of the type:
```ERROR: Input of fragment shader 'viewNormal' not written by vertex shader```

UI: particle deflector options in topbar

See: T57228

Cleanup: better naming

Suggested by Campbell here: https://developer.blender.org/rB09cd651bb7e59044cbcd0664e8b1064cb37734ed

Gizmo: change axis used for shear handles

The shear direction should be more obvious this way.

Transform: map mouse input to shear direction

Transform: show arrows for 'custom' ratio input

Arrows are now shown for vertex/edge slide.

RNA: disable notifiers from property updates

This was re-enabled because it made copy-on-write bugs hard to
track down.

Since copy-on-write implementation has been simplified
this isn't a problem anymore.

Cleanup: naming

Cleanup: whitespace

Fix T56735: Autosmooth option corrupts UVs