Fixed potential memory leak

Replaced GLRenderer::m_width and GLRenderer::m_height with width() and height() calls.

Moved more business logic out of GLRenderer into Canvas. GLRenderer::pick(const QRange&) now returns a set of LDObjects without modifying them. Replaced the GLRenderer::pick(int, int) overload with GLRenderer::pickOneObject.

Made GLRenderer's Model pointer const

Moved more editing-related methods to Canvas.

Removed the unneeded makeCurrent overload

Moved more methods only used by canvas code from GLRenderer to Canvas. Thin border pen is now a static constant.

Moved triangle count rendering to Canvas

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

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