[FR] M73 Enhancements

[benlye]

M73 currently takes a single P parameter to manually set the progress bar percentage. There is a new OctoPrint plugin, M73Progress, which will update the progress bar by periodically sending M73 commands.

The first thing I found is that LCD_SET_PROGRESS_MANUALLY requires SDSUPPORT, but with a couple of simple changes that dependency can be removed (I don't have an SD reader and don't particularly want full SD support enabled).

Then I thought it would be neat to also be able to update the timer above the progress bar, either with time elapsed or time remaining. Something like M73 T[seconds].

Any thoughts on those two changes? I'm happy to put together a PR here and for the OctoPrint plugin.

[benlye]

I've been tinkering around with this and have found a couple of interesting bugs with the progress bar:

• A progress time of >= 100 days (8640000 seconds) will cause Marlin to reset
• A progress time of exactly 1 day (86400 seconds) displays incorrectly as 00:00 instead of 1 day 00:00

A print time of 100 days is pretty unlikely, but I figure having Marlin reset for something like that is uncool, and avoidable. I'll submit a separate patch for those.

[benlye]

Created #9202 and #9203 to address the display issue when the time is exactly 86400s.

[github-actions]

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