Blender Git Loki

T54983: Bone selection overlay

Bone selection overlay is only available in pose mode.
and when active overrules the selection buffer.

This is currently `tricked` by switching the draw engines, but this is
an exception. Not sure how to solve this in a better way.

After this is solved we can look at how to localize the dim effect to only the objects connected to the active armatures. Currently it dims the whole screen (including background).

@campbellbarton I added you as reviewer as it you have done a lot in the DRW_draw_select_loop

Reviewers: campbellbarton, fclem

Reviewed By: fclem

Subscribers: campbellbarton

Tags: #bf_blender_2.8, #code_quest

Maniphest Tasks: T54983

Differential Revision: https://developer.blender.org/D3241