Jacques Lucke
4599cea15d
The main goal of this refactor is to not store Object/Collection pointers for every individual instance. Instead instances now store a handle for the referenced data. The actual Object/Collection pointers are stored in a new `InstanceReference` class. This refactor also allows for some better optimizations further down the line, because one does not have to search through all instances anymore to find what data is instanced. Furthermore, this refactor makes it easier to support instancing `GeometrySet` or any other data that has to be owned by the `InstancesComponent`. Differential Revision: https://developer.blender.org/D11125