Moved document editing methods from GLRenderer to Canvas

Created a new GLRenderer derivative class "Canvas" and made MainWindow use it

Cleaned up code in LDDocument and removed unnecessary flags and methods. Flags turned into bools.

Removed some unused code

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.

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