[BFW-5923] Make serial printing screen a menu option (Implements #4070)

[PinkPandaKatie]

This adds a toggle menu option under User Interface to enable/disable the serial printing screen.

[danopernis]

Hi @PinkPandaKatie thanks for the contribution.

Since we recently changed the master branch, I have taken a liberty of rebasing your PR and resolving conflicts.

Overall I quite like the change and find it useful for expert users. IIRC the serial printing screen exists to prevent interaction with the printer via the LCD. Interactions may lead to failed prints, akin to inserting random G-codes to the instruction stream. I would be happy to merge this if you moved the menu item to the "Experimental Settings" menu which is more difficult for regular users to access. This way I wouldn't need to go through the product department to get their approval. What do you think?

Rant: if only there was a "Start printing" and "End printing" G-code which would enable us to clearly differentiate between various printer states instead of using heuristics like "Is it a movement G-code?"

[PinkPandaKatie]

I definitely agree with needing "start" and "end" G-codes - I went looking for them before even starting on this PR. I am fine moving it to Experimental settings.

I am curious about one thing, though - Is there a way to enable the experimental / dev settings (i.e. the green menu items) on stock firmware?

[PinkPandaKatie]

Ok, I think I got it moved. I did do a local build, but I haven't had a chance to test it because I'm in the middle of a long print right now.

[danopernis]

Looks good to me.

Regarding your question about development (green) menu items: no, you can't enable them on the production firmware. There is a CMake option DEVELOPMENT_ITEMS_ENABLED which translates to a compile-time constant GuiDefaults::ShowDevelopmentTools which in turn controls if the menu item is displayed.