Apply clang format as proposed in T53211.
For details on usage and instructions for migrating branches
without conflicts, see:
https://wiki.blender.org/wiki/Tools/ClangFormat
So far this makes a new pass for image empties that does not write to the depth buffer.
Todo:
- Sort empties using `DRW_pass_sort_shgroup_z`.
- Calculate correct bounding boxes.
- fix bounding box memory leak.
Reviewers: fclem
Differential Revision: https://developer.blender.org/D3922