Blender Git Loki

Mirror modifier: Avoid manual placement of dummy decorators for alignment

There's an option to let interface code do this now.

Fix use-after-free again

Merge branch 'temp-checkbox-layout-tweaks' into modifier-panels-ui

Use row headings for sculpt symmetry options

Also removed redundant columns.

Support heading in row layouts too - `uiLayout.row(heading="FOO")`

Use property split layout for sculpt symmetry options

Meant as an example of how to do this with Python. Wasn't possible
without a broken layout until the previous commit.

Fix more cases of recursive property splitting

A bit hacky, but we have to disable the `use_property_split` flag for a
row after adding the split layout to prevent it from further splitting
when adding more items. If these new items actually add multiple buttons
(vector items), these should be placed in a column like before (by
accident?). E.g. that's how the translate buttons (a vector item) is
aligned with the lock icons (another vector item).

Use column heading for Bevel tool settings

Use checkbox+value for Text Editor

Modifier UI: separate the Apply/Shape/Copy buttons visually from the modifier controls

Also make these items smaller, to de-emphasize them.

Use checkbox+value configuration for Decimate modifier UI layout

Revert mistake in Sculpt Symmetry panel

Add checkbox+value configuration many places where applicable

Update Vertex Weight Edit modifier UI layout

Add UI for recently added bone properties

Merge branch 'master' into modifier-panels-ui

Resolve crash when switching to grease pencil object

Small tweaks to bevel modifier UI

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

Refactor saving and setting list panel expansion

The public functions are named more sanely and their requirements are
much simpler, with more of the logic handled internally by interface_panel.c.

Also solves a bug saving and loading sub-subpanel expansion.