Blender Git Loki

BKE: bvhutils: Port bvhtree_from_mesh_get to take a Mesh param instead of a DerivedMesh.

Differential Revision: https://developer.blender.org/D3227

Extrude Widget: with/without axis constraint

Extrude Widget: tweak draw style

Use filled circle for redo

Cleanup: naming (prefer len over num for new code)

Cleanup: mesh_runtime naming

- BKE_mesh_get_looptri_num -> BKE_mesh_runtime_looptri_len
- BKE_mesh_runtime_recalc_looptri -> BKE_mesh_runtime_looptri_recalc
- BKE_mesh_get_looptri_array -> BKE_mesh_runtime_looptri_ensure

Missed last commit

Merge branch 'master' into blender2.8

Modifier stack: partial port of ShrinkWrap to new Mesh-based system.

Partial only, complete depends on BVHTree helper updates, and subsurf
updates.

Modifier stack: Port Warp to new Mesh-based system.

Modifier stack: port Mask to new Mesh-based system.

Cleanup: includes

Cleanup: move mesh conversion into own function

Modifier stack: Port Caqst to new Mesh-based system.

Collections: remove per collection and view layer engine overrides.

This will be handled by the new view layer override system which will
store data elsewhere, removing the code already for easier refactoring.

Cleanup: consistent BKE_mesh naming

Cleanup: use bool for BKE_mesh_new_from_object

Cleanup: rename variables

DerivedMesh had some odd conventions, remove from BKE_mesh.

Cleanup: use 'nomain' when not in library data

Rename only.

Cleanup: whitespace, duplicate includes

Modifier stack: Port Smooth to new Mesh-based system.