Blender Git Loki

Alembic import: changing cache modifier path no longer discards object paths

This allows, for example, the path of an Alembic file to be changed from
absolute to relative, without having to reconstruct all object paths.

Alembic: properly initialising cachefile object paths list.

Alembic: fixed memory leak

Alembic: Construct ISampleSelector once and pass along

No longer passing time as float and constructing ISampleSelectors all
over the place. Instead, just construct an ISampleSelector once and
pass it along.

Cleanup: move draw-cache creation from BKE to DRW

Creating draw-cache should only ever be used by the draw-manager.

fix for jumps in rotation when converting to keyframed objects

Unify RNA and core depsgraph.objects

Note: Since this is not listbase nor array I'm also expanding
RNA_types.h to allow for custom data.

Move DEG_OBJECT_ITER inside depsgraph

Cycles: Cleanup, indentation in preprocessor

Cycles: Cleanup, indentation inside preprocessor

Cycles: Fix regression in SSS rendering after principled commit

Cycles: Cleanup, indentation of comment

Was broken after principled commit.

CMake: Add option to link against system-wide Gflags library

It is disabled by default, so should not affect existing configurations.

Main benefits of this goes as:

- Linux distros can use that to avoid libraries duplication and link
blender package against gflags package from the system.

- It it easier to test whether Blender works with updated version of
Gflags prior to re-bundling the library.

Cleanup: use id-property access macros

Depsgraph: Move DAG_get_object function

BKE_depsgraph.h will be deprecated eventually, so moving it to DEG_depsgraph_query.h

Draw Manager: don't assign bool from flags

Some MSVC versions don't support this.

Gawain: fix for building empty element list

Rename: Alembic job struct sl > scene_layer

Draw Manager: edit-mode 3d text drawing

Draw cursor and selection, also support for fast-display.

Include the set in the depsgraph objects iterator

Pending: Include the set in the rna depsgraph.objects

In fact it would be nice to unify them both. However this will likely
change once Depsgraph incorporate this iterator, so I'm not sure we
should bother with that.

Related to T51203