Removed unused code

Extracted the state of the program into a MainState structure, and extracted local functions of main() into static functions.

Move some recent file handling to MainWindow

`PartRenderer::renderVao` no longer throws if bad array class is given, this is now checked on compile time

The renderer now centers on the grid origin, not the part origin

Hopefully fixed all problems with determining polygon winding

Add settings import and export

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mercurial