Blender Git Loki

DrwManager: Add the possibility to invert backfacing.

This is done in order to support planar reflection rendering.

GPUFramebuffer: Add support to attach individual texture layer.

Manipulator: de-duplicate flags and scale option

Cleanup: move copy-paste code into function

Merge branch 'master' into blender2.8

Cleanup: doxygen comments

Also remove duplicate & mismatching comments from grease-pencil header.
Keep comments close to implementation to avoid getting out of sync.

Fix T51774: Children particles hair interpolation not correct with textures or dp.

Children where always getting at least one segment of fixed length...

Now fully hidden ones (zero length) get no segment at all.

Note that even very short ones keep getting one 'unit' length segment - would
rather avoid changing that at this point, given how complex children
particles 'length' can get with all kind of modifiers... Think we can
live with that for now anyway.

Fix T51840: UI redraw in node editor header missing on pointcache bake

Missing a notifier handler in the node editor

Fix unreported: Copy-pasting nodes crashes when they have an undefined type

Manipulator: comments

Manipulator: use matrix for manipulator direction

Remove type-specific axis functions.

Manipulator: use matrix instead of origin

This avoids having to use manipulator-type specific functions
to set the orientation.
And will make it simpler to access transformation from Python.

Currently the matrix is still used as an offset in places.
Also per-type orientation values still need to be removed.

Docs: Fix file:line links in generated API docs

Add Cone: tip soft-min should be zero

Default value should be included in range.

Merge branch 'master' into blender2.8

Cleanup: use uint

Guarded allocator: Fix type in macro definition

The crash did not happen yet because we always had proper vmemh defined in
the parent scope.

Patch by Ivan Ivanov (aka obiwanus), thanks!

Differential Revision: https://developer.blender.org/D2715

Manipulator: draw options for dial

- Option to start helper angle lines based on a vector
instead of the initial mouse coords (useful for bisect & spin).
- Option to show 2x helper lines
useful when dial is used to rotate an axis value.

Manipulator: correct dial angle

Calculation was done in screen-space giving inaccuracy,
making the angle incorrect for tool code.

Cast mouse coords onto the dial plane to calculate the angle instead.

Manipulator: fix general purpose dial use

Wasn't checking own location when checking if flip is needed.