Blender Git Loki

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Geometry Nodes: simplify and deduplicate callbacks on sockets

This adds a layer of abstraction between the code calling callbacks
on sockets and the implementation of those callbacks.
This abstraction layer allows some sockets to not implement all
callbacks when those can be derived from some other callback.

Geometry Nodes: change "Node Tree" to "Node Group"

Geometry Nodes: initial support for evaluating geometry node groups

This is still very basic and does quite a few unnecessary computations.
Also the error handling is quite weak currently, so when invalid things are
connected, it will probably just crash.

Also the interface that individual nodes have to implement will have to change,
but the current solution is a good starting point.

Only the triangulate node is implemented for now.

Geometry Nodes: add an initial geometry class

Functions: add generic pointer class

This class represents a pointer whose type is only known at runtime.

Functions: add move operations to CPPType

Merge branch 'asset-metadata' into asset-browser

Merge branch 'master' into cycles_procedural_api

Merge branch 'master' into cycles_procedural_api

Merge branch 'master' into asset-metadata

LineArt: Reduced vert intersecting data size.

LineArt: Reduced triangle intersecting data size.

LineArt: Intersection vert data now allocated in extended way.

LineArt: Use global vert index to detect share_edge

LineArt: Fix vertex group name induced early return in modifier.

Made dyntopo collapse make nicer transitions between different densities
of verts

LineArt: Hacked culling adjacent data

Merge remote-tracking branch 'origin/master' into lanpr-under-gp

# Conflicts:
# release/scripts/addons
# release/scripts/addons_contrib

Geometry Nodes: Add initial node definition for edge split

This is just based on rBa7dba81aab22, and contains no funcionality at all.