Blender Git Loki

Viewport Compositor: Add DEG eval callback and redraw listener

This is pretty basic but it gets the job done. This may change in
the future.

The `NodeType` (SHADING) for the `OperationKey` is not ideal.

Also it seems the tagging comming from the nodetree tag everything
as COPY_ON_WRITE update. Which is slow. To investigate.

Cleanup: Naming

progress

Fix security popup re-displaying after undo

Don't reset these flags when loading a file (or undoing)
rely on BPY_python_reset to reset the flags.

Fix memory leak if an error occurred assigning id-property sequence

Fix bisect gizmo offset while dragging

Address inlines

Minor cleanup and tweaks

Fix overlay draw order.

Fix incorrect flag for `show_image_outline` property

Fix spelling

Don't use pixel unit for origin property

Revert "Use box select as default tool in preview"

Address inlines

Fix flickering when navigation ends

GPencil: Fix dash modifier reading error.

The reference for parent modifier in segment data is not assigned. Now fixed.

Fix crash when removing a subsurf modifier after another subsurf.

Fix crash caused by invalid BMesh used.

Fix UBO padding.

Set `V2D_IS_NAVIGATING` flag when zooming with scrollbars