Blender Git Loki

Tweak behavior of object.to_mesh()

- Passing original object with apply_modifiers=false will give a
non-modified non-deformed mesh.
The result mesh will point to datablocks from the original "domain". For
example, materials will be original.

- Passing original object with apply_modifiers=true will give a mesh which
has all modifiers applied.
The result mesh will point to datablocks from the original "domain". For
example, materials will be original.

- Passing evaluated object will ignore apply_modifiers argument, and the
result always contains all modifiers applied.
The result mesh will point to an evaluated datablocks. For example,
materials will be an evaluated IDs from the dependency graph.

Fixes T62916: Applying boolean modifier does not set material properly

Differential Revision: https://developer.blender.org/D4604