Removed some unnecessary #include-directives.

Removed the status bar, since it's not used for anything

Split object list representation into virtual methods

Removed LDDocument::getObjectCount (superceded by Model::size)

The "all objects have valid models" invariant seems to be holding up now. At least basic drawing works again.

Made all LDObject constructors protected. Emplacement is now the only way to create objects.

Removed the LDSpawn function and replaced its last use cases.

More rework on model stuff, removals of LDSpawn calls. Most importantly, the LDraw code parsing function was moved to Model.

Removed uses of LDSpawn in the algorithm toolset

Replaced uses of LDSpawn with the Model class in edit modes

Removed dead code that's standing in the way of refactoring

Removed the AddObjectDialog. Garbage code that absolutely needs to be reimplemented.

Made the quad→triangles use emplacement. However, now it crashes because of problems in the underlying system (the LDObject constructor shouldn't do anything in regard to the model!)

Major overhaul of object→document relationship: added the Model class which models the object buffer. Each object is to be included in a model (an invariant that currently does not hold). A document is a subclass of a model. The LDObject is also now agnostic about selection, and the selection is now a set. A lot of things are probably broken now but it's a major step forward.

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