Blender Git Loki

Add simulation node tree type

This implements a new builtin node tree type called `SimulationNodeTree`.
It is not yet embedded in the `Simulation` data block.

This is part of T73324.

The `WITH_NEW_SIMULATION_TYPE` cmake option is used to control whether `Simulation Editor` is shown in the editors menu.
Disabling the rna code with this option was a bit tricky, because the node tree type stores a reference to the rna type.
I could do the `#ifdef WITH_NEW_SIMULATION_TYPE` everywhere, but I'm not sure if it is worth the effort.

Currently there is only the group node, which is unusable, because there are no other nodes.
I'll submit those for review separately.

Differential Revision: https://developer.blender.org/D7287

Merge branch 'functions' into builtin-simulation-nodes

Merge branch 'master' into functions

Merge branch 'master' into simulation-data-block

Merge branch 'master' of git://git.blender.org/blender

Implement panels for more modifiers

UI layouts WIP

Rename panel to panelRegister

Merge branch 'master' into modifier-panels-ui

Only rebuild panels when modifier list changes

Benefits of this:
- Epanding and collapsing modifier panels works
- Efficiency
- Solves other handler crashes

Also renamed modifier_index to list_index for more generality

Remove unecessary changes

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-object

GPencil: Improve Mesh to GPencil edge conversion

Now the strokes are done using edge loop calculated.

add switch node ui

add a couple more node uis

add Float Compare node

add boolean math node ui

Merge branch 'functions' into builtin-simulation-nodes