Blender Git Loki

use better error handling for other emitters

better error handling when creating function for emitter inputs

move FunctionBuilder to separate file and add more methods

namespace fix

Improve error handling with ValueOrError class

We might want to use exceptions instead of this.
I'm not sure yet.

cleanup finding placeholder dependencies

cleanup finding node inputs

minor improvements

rename BTreeDataGraph to VTreeDataGraph

move function generation file to correct file

fix uninitialized memory

Remove Composition data structure

This simplifies the code and speeds up accessing function
bodies and type extensions. Now, a lock is only necessary
when create new bodies or extensions.

This is achieved at the cost of having a slighly less generic
system, because we have to give e.g. different function body
types different IDs. Since the number of different types
is expected to be fairly low, this trade off is worth it.

simplify virtual node tree usage

Merge branch 'master' into functions

reorder lines

remove builders that are not necessary for now

remove unnecessary usings

remove unnecessary type definitions

remove "small" from test names

rename SmallVector to Vector