Blender Git Loki

Writefile: Cleanup Soung runtime data.

Writefile: Cleanup World runtime data.

Writefile: Cleanup Lattice runtime data.

Writefile: Cleanup Text runtime data.

Writefile: Cleanup VFont runtime data.

Writefile: Cleanup material runtime data.

Writefile: Cleanup MBall runtime data.

Writefile: Cleanup Scene runtime data.

Writefile: Cleanup Object runtime data.

Writefile: Cleanup Curve runtime data.

Embed simulation node tree in simulation data block

This also shows the node tree in the Simulation Editor.
There is a new operator to add a simulation.

One debatable aspect of this patch is how I integrated the `SpaceNodeEditor.simulation`
property in RNA. I decided to wrap the existing `id` property, because the description
says `Data-block whose nodes are being edited`, which is exactly what is happening here.

Differential Revision: https://developer.blender.org/D7301

Solved a threading issue and made moving object collisions be detected

Fix T75222: Crash activating menu search

Cleanup: clang-format

better handling when id has wrong type

better support for building without simulation type

show some builtin nodes in menu

support adding new simulation from header

cleanup simulation property of space

Merge branch 'simulation-tree-arc' into embedded_simulation_node_tree