Blender Git Loki

USD: added debug function for printing the export graph

USD: removed 'parent_writer' pointer

The `parent_writer` pointer was intended to be used by an Alembic writer,
but now it's getting in the way. I'm removing it from the
`AbstractHierarchyIterator` with the intent of either restoring it or
finding another solution when we actually implement Alembic writers.

USD: Fix missing writer pointer

Fixes bug introduced in previous commit.

use step block data in more functions

use step block data in more functions

introduce BlockStepData as container for data that would have to be passed into many functions

initial forwarding listeners + particle trail node

Still looking for a better name instead of Forwarding Listeners

Cloth: initial steps towards computing face sizing

Merge branch 'master' into functions

Merge remote-tracking branch 'origin/master' into soc-2019-npr

Cloth: initial steps towards dynamic remeshing

GPencil: Fix length modifier wrong callback.

LANPR: Description of auto update write as "frame changes".

Cleanup: Make format.

GPencil: Sample modifier accepts 3 points at least.

GPencil: Relieable counter for sample function.

Outliner: Search recursively for icons in row

Rather than searching just the child list, search recursively
down the tree to allow clicking on all icons.

Outliner: Allow clicking on row icons

The feature to click on row icons was removed (presumably because
the icons now draw stacked with a number, rather than individually).
This brings back support for clicking because the benefits of
clicking on the icon without opening the element outweighs the con
of not being able to select grouped elements. A solution for that
is being worked on.

Outliner: Show active improvements

Prevent the show active operator from scrolling beneath the
allowed scrolling range. This removes jumpy redraws after the
operator executes.

The horizontal centering is difficult, because the elements
outside the view of the outliner do not have the xend properly set
and the max width of the outliner is not properly calculated.
This means it is not possible to center the x position while
keeping the view in range of scrolling.

This could be resolved by drawing the outliner after setting the y
position, but that is not an ideal solution.

[Fast import/export] Added boiler plate for OBJ importing