Blender Git Loki

Use BKE_mesh_apply_vert_coords instead of local defined version

Fixed mesh_calc_modifier()

This makes generating modifiers work as well.

Changes from review

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm

No more DerivedMesh in mesh_calc_modifiers

Also a little cleanup.

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm

First pass at porting mesh_calc_modifiers from DerivedMesh to Mesh

DerivedMesh is almost completely removed from the main loop.

Added `_dep` to dm pointers to make usage of them easy to locate by
searching for `dm_dep`.

Still some work to do. It looks like some of these code paths aren't
entered into, maybe things could be simplified if we can be sure of
whats actually needed.

Port various util functions from DerivedMesh to Mesh

Adds the following functions which are duplicates of
their `DerivedMesh` counterparts:
- `apply_vert_coords`
- `mesh_set_only_copy`
- `create_orco_mesh`
- `add_orco_mesh`
- `calc_weightpaint_vert_array_mesh`
- `mesh_update_weight_mcol`
- `mesh_init_origspace`

Add modifier_deformVerts_ensure_normals

Same as modwrap_deformVerts but for Mesh

Add BKE_mesh_is_valid

Add modifier_deformVerts_ensure_normals

Same as modwrap_deformVerts but for Mesh

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm

Formatting

Use proper way to get CoW original

Mesh *to_use ? mesh_src

FIXUP for ModifierEvalContext introduction

Quiet unused var warning

Merge remote-tracking branch 'origin/blender2.8' into temp-modifier-rm-cddm