Blender Git Loki

Volumes: fix memory leak in grids depsgraph backup

Merge branch 'master' into new-object-types

Merge branch 'master' into new-object-types

Volumes: browse VDB files from add menu, auto detect sequences, drag & drop

Cleanup: split image sequence detection into own file, and make it reusable

Volumes: add global volume grid cache

This is used for sharing grids between multiple volume datablocks with the
same filepath, and sharing grids between original and copy-on-write datablocks
created by the depsgraph.

Volumes: use principled volume by default in volume object materials

This is mostly straightforward, but required some refactoring in Cycles to
ensure that the default volume material does not always turn on the volume
feature for GPU rendering.

Merge branch 'master' into new-object-types

Volume: initial support for frame sequences

There is frame duration/start/offset just like images. A difference is
that there are more playback modes: clip, extend, repeat, ping-pong.

Still missing is auto detect of frame sequences, the duration has to be
manually entered now.

Volumes: debug logging for grid file load/unload

Volumes: show active grid in workbench

Merge branch 'master' into new-object-types

Fix various build issues

Objects: modifier stack integration for hair, point clouds and volumes

This is more a prototype for testing, it's not clear yet if we want to use
the existing modifier stack or immediately go to nodes.

Currently working are a few deform modifiers for hair and points clouds.
The infrastructure for constructive modifiers is there as well, just none
are implemented.

Hair: add initial Cycles rendering support

UI: use full width for ID blocks in hair/pointcloud/volume properties

Fix compile error

'data_orig' / 'data_eval' are already ID.

Fix new object types missing for viewport visibility menu

Volumes: expose grid data type in Python API

Volumes: use full transform matrix for workbench drawing