Blender Git Loki

Fix typo in previous commit....

Cleanup: Rename panel type flag from extend to expand

Not sure why I used extend, probably just because of brain dead
programming :)
Also, expose the flag to python panel options.

Merge branch 'modifier-panels-ui' of git.blender.org:blender into modifier-panels-ui

Deduplicate code, fix crash moving panels quickly

The method to check if the panel list represents data is now generalized.
Also actate EXIT panel state when freeing list panels when there is still
a handler attached.

Constraints UI: Layout tweaks

Increase consistency between constraints layouts.

First pass of layout updates for remaining constraints

Implement expansion saving, drag drop for constraints

The move constraint to index operator still needs a proper poll function.

Rework UI layouts for Transform Constraints

Update layouts to 2.8 style, which is generally a huge improvement
for legibility and consistency. Doesn't touch decorators, there are still
issues there.

Also deduplicate some code by using a class for all parent
constraint panel and all constraint subpanels.

Cleanup: Fix mispelled "constraints"

Add list subpanel to UI

Merge branch 'modifier-panels-ui' of git.blender.org:blender into modifier-panels-ui

Initial implementation of constraint panels

The layouts are still defined in python, but they are each in a separate
panel. They are named and searched for with the constraint type info
struct names.

This commit does not change the layout for any of the constraints.

Add list panel index to RNA

Needed to support creating list panel layouts in python.

Also check for unimplemented list panel functions before calling.

UI: Rename Cast Type to Shape

Clearer naming

Merge branch 'master' into modifier-panels-ui

Merge branch 'panel-drag-scroll-region' into modifier-panels-ui

Fix, add comments

Initial implementation, not quite working

Use simpler solution

UI: Fix last panel dragging affecting region scroll

When finding the total height of the region's panels for scrolling, we
should use starting position of the drag, because a drag and drop doesn't
change the resulting height of the region.