Blender Git Loki

Fix return in BKE_scene_layer_find_from_collection

More lamp work

Use vec2 for screen space stuff

Lamp sunrays and shadow circles

Bring back the select button for the UI

Fix unfreed memory

Fix warnings

Fix depth not cleared

Bypass wires.

Fix ogl warnings.

Fix assert

Added Lamp screen space visual

Start of Lamp drawing

Groundline/GroundPoint shader for lights

Clay Engine per-collection settings

Note: this is still not used by rendering

Introduce Per-Collection Render settings

Pending:

* UI template for those settings (showing USE)
* Depsgraph evaluation of them (to flush into objects)
* RNA to see if a settings is being used

Fixing Memory Leak

Implemented All Empties type drawing

Silence more warnings

This should silence the current warnings, and gives us real warnings if
the bContext data is tampered with.

Silence warning

There is still a warning because of `DST.context = C;` which discards
'const' qualifier. I find this a legit problem, I suspect we are not
suppose to store bContext at all.