Add Part Bounding box on Gcode Graphics

[satiowadahc]

Replacing #2887, now rebased on master.

[satiowadahc]

@c-morley

        if self.state.magic_comments["disable_preview"]:
            LOG.info("Preview Disabled by comments")
            self.ui.gcodegraphics.show_program = False
            return
        elif os.stat(file_name).st_size < self.max_graphics_file_size:
            self.ui.gcodegraphics.show_program = True
        else:
            self.ui.gcodegraphics.show_program = False
            LOG.warning(f"File To Large ({os.stat(file_name).st_size/1000000} mb), Preview disabled")

This is how I use it on my GUI, opinion if this should be moved into gcode graphics or leave it to each GUI's preferences?

[c-morley]

As long as the max file size can be arbitrarily set relatively easily, I like consistency between the GUIs.

[satiowadahc]

Set a default max file size, check with INI for updated value, then add getter/setters?

[c-morley]

I'd think just a function to set it would be fine. A GUI then could set it if it's required, I suspect it won't happen often. What do you think?

[andypugh]

I have assigned this to @c-morley to decide whether to merge or not. I don't know enough to decide.

[c-morley]

Thank you.