Blender Git Loki

From review: proper handle of library_query

Beginning Clay Viewport Engine :
- Added temporary draw_mesh function to render edit mesh
- DRW_draw_batch_list allows to render a list of objects with optimal state change
- All viewport rendering is done offscreen for the moment

Signed-off-by: Clément Foucault <foucault.clem@gmail.com>

unittest: fixup

Revert "Make sure new objects go to the correct (active) collection"

This reverts commit c51a32554e02a9d27d5e6491e2589f4406f17ad1.

Revert "Fix warning"

This reverts commit 280da495957ec0bfbd21d17e2a0dc5819719ed7b.

unittest: object_add

unittest: active_collection_index

bpy.context.render_layer

Fix warning

Merge remote-tracking branch 'origin/blender2.8' into render-layers

Include manual changes to accomodate new do_versions_after_liblink

Make sure new objects go to the correct (active) collection

unittest touch ups

render_layer.collections.link/unlink()

unittest: new layer, layer_collection_link/unlink

Fixup for rna_SceneCollection_remove

Debug UI revamp

unittest: syncing when unlinking a collection

Syncing: update layercollection tree when an object is unlinked

Note: filtering is not implemented/fully considered yet

Layers: unittest to cover unlinking of objects

Syncing: an object added to a scenecollection

Also changed the ObjectBase->refcount logic a bit, to simplify
further implementations of syncing.