PFW-1061: #2093 - Relocate sheet menu, show sheet on info screen

[vintagepc]

Implemented #2093
-Sheet is shown instead of percentage done either if idle, or during
print preheat. (Both consume exactly 7 characters)
-Relocated sheet menu to below SD menu for additional visibility to
current sheet.

[DRracer]

@vintagepc Good ideas, thanks for your PR. For now the sheets menu will be like we have it in #2145, but I really like your idea about the status screen showing sheet name instead of percentage in idle. I'll talk about it with our content guys.

[vintagepc]

That's fair, looks like we essentially did the same thing for the menu move (though I didn't hide mine if there's only a single sheet in use)

[vintagepc]

I'll merge to synchronize with #2145's changes and I realized I can also toss in a fix for #2089 which should be an easy fix.

[vintagepc]

Fixed #2089, merged Mk3

[DRracer]

@vintagepc I'm marking this as 3.9.x but please note we are still to gain some significant user response about the sheets, so this PR may require some more changes

[vintagepc]

Understood, I'm hoping to keep it maintained as new features are added to the firmware.

[vintagepc]

I merged 3.8.1-RC1 into my local branch which has this applied and it still functions as expected 👍

[DRracer]

besides the cursor '^' change we are ready to merge this, please finish the PR as requested, thank you

[vintagepc]

I guess I can cross "Earn 'contributor' badge for Prusa Github" off my bucket list now 😄