Show an error message box when main file loading fails.

A saving failure is a critical error, not a warning and should be drawn as such

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.

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mercurial