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.

Happy new year 2017!

Matrices are now input with 9 spinboxes instead of a MLCad-style line edit

Moved the identity matrix constant into Matrix's namespace

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mercurial