Blender Git Loki

Ported DEG_add_operation() calls over to the new API

Start differenciating between "subdata" names and "operation" names

* Subdata names are for nested components (e.g. bones)
* Operation names are for the names of specific operations within a component

Ported over DEG_find_node() to new API

Draft tagging + subgraph building steps for groups

Skeleton for handling Rigidbody Sims

Jotting down connection points between depsgraph and geom eval

Crappy draft of basic traversal mechanism

Bugfix: Complete partially completed def (for bone parenting)

Draft skeleton for sorting nodes...

First draft of building code for rigidbody sim

Blurb explaining design decisions for how rig graphs are constructed

Stubbed in animdata-adding for "Armature" data

There are still many todo's to be fixed up here for nice instancing,
but those require some other changes (aka proper proxies first). In the
meantime, we just want to be able to port this all up...

Spline IK - Also add links back to root of chain (as for IK)

Temporary hack for name used when adding constraint stack op

This is because, this name currently serves double-duty when we're faced
with subdata nodes... This needs urgent fixing!

IK Solver - Keep a reference back to the root node of the tree in the solver

Include link from IK-solver owner to IK Solver

Compositing nodetree graph building - just plain wrapper for now

Ported rest of constraint stack graph building code

Comments - noted some issues re IK-Solvers steps which need to be solved still

Attempted to port motion-tracker constraints to new system

* Most of this seems to port over ok
* Still not sure what exactly the "scene relation" at the end is for
* Because we've got a more descriptive system now, there's probably a lot
more that we can describe here now that wasn't possible before. However,
since I'm not familiar with this, I'll leave it as-is for now.