Blender Git Loki

Added stuff to make MeshAdd access faster.

Faster find_coplanar_parts.

Fixed memory leak of bvh trees.

Use BVH for partset pair intersection tests.

All regression tests pass.

Added kdtree for faster coplanar.

Stashing progress.

Fixed gwn (atan2 instead of atan), and some perf speedups.

Boolean coplanar cone-on-cube works.

Needed some work on coplanar faces that may have
reversed normals from projection.

Attempt to do boolean with coplanar faces - doesn't work yet.

Forgot to initialize an intset.

Plumbed through faces that are on both sides of boolean op.

Keep track of other orig faces besides eg for a face.

Regression tests 0-25 all pass.

Code was working but had commented out actual apply of meshchange.

clang-format

Most regression tests now pass.

Put in option checkbox in UI so can choose old or new method.

Stash changes.

Coplanar case works except CDT makes a face with repeated vert.

Changes to master for this branch.

All tri-tri non-coplanar tests work.

Overlay Engine: Refactor & Cleanup

This is the unification of all overlays into one overlay engine as described in T65347.

I went over all the code making it more future proof with less hacks and removing old / not relevent parts.

Goals / Acheivements:
- Remove internal shader usage (only drw shaders)
- Remove viewportSize and viewportSizeInv and put them in gloabl ubo
- Fixed some drawing issues: Missing probe option and Missing Alt+B clipping of some shader
- Remove old (legacy) shaders dependancy (not using view UBO).
- Less shader variation (less compilation time at first load and less patching needed for vulkan)
- removed some geom shaders when I could
- Remove static e_data (except shaders storage where it is OK)
- Clear the way to fix some anoying limitations (dithered transparency, background image compositing etc...)
- Wireframe drawing now uses the same batching capabilities as workbench & eevee (indirect drawing).
- Reduced complexity, removed ~3000 Lines of code in draw (also removed a lot of unused shader in GPU).
- Post AA to avoid complexity and cost of MSAA.

Remaining issues:
- ~~Armature edits, overlay toggles, (... others?) are not refreshing viewport after AA is complete~~
- FXAA is not the best for wires, maybe investigate SMAA
- Maybe do something more temporally stable for AA.
- ~~Paint overlays are not working with AA.~~
- ~~infront objects are difficult to select.~~
- ~~the infront wires sometimes goes through they solid counterpart (missing clear maybe?) (toggle overlays on-off when using infront+wireframe overlay in solid shading)~~

Note: I made some decision to change slightly the appearance of some objects to simplify their drawing. Namely the empty arrows end (which is now hollow/wire) and distance points of the cameras/spots being done by lines.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6296