Removed all overlay support. It's a messy pile of mess and I will reimplement it later as background images and it will be much better then.

GLRenderer no longer exposes the model pointer.

LDGLData merged into GLRenderer since it only deals with one document now. GLRenderer generalised from rendering documents to models.

Made a new renderer be created for each document, instead of reusing the same renderer for all documents.

Simplified GLRenderer::convert3dTo2d. The multiplication with the modelview matrix is not necessary, it's identity all the time... with that, I think the function makes much more sense now.

- Use a QGenericMatrix to store the matrix, instead of a C array

Changed from GLdouble to GLfloat. Apparently the performance difference is greater on the GPU..? It doesn't really matter but let's be consistent.

GLRenderer::clampAngle is no longer used as of the previous commit so we can do away with it.

Switched from euler angle rotation to matrix rotation. Gimbal lock is now broken.

Wrote documentation to the Model class.

The current document pointer may no longer be null.

minor amendment

Reworked and cleaned up the circle mode

Some code cleanup in abstract editing modes.

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Removed LDDocument::getObjectCount (superceded by Model::size)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