Warn for save failures with the save and save as actions, also provide with a button to save the file under a different name.

Keep track of when the file was last saved and warn if there are unsaved changes when the application is closing.

Grid icons..

Make grid actions regular actions rather than auto-generated, this way they can have keyboard shortcuts

Added three configurable grid layouts, coarse, medium and fine grids, like those of MLCad. The grids are considerably finer by default simply because part editing works at a lower scale than model editing.

Added the about dialog.

Rotate subfiles and radials by their origin and not by their contents' bboxes.

Rotation improvements; allow radials be inlined

Rotation and rounding. Rotation needs work to get proper origin stuff

some GUI tweaks

Added winding reversal, though undoing it isn't quite ready yet.

Generalized SetContentsHistory to an EditHistory

Some renaming

Redrew selection icons to be clearer

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