PFW-1204: M600 - Show filament name at the Insert filament prompt

[Panayiotis-git]

This PR is an upgraded version of the #2380.

It introduces the C parameter that defines the filament name to be displayed at the Insert filament and Loading filament messages. The filament name must be enclosed in double quotes.

The new syntax is:
M600 X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal] C"[filament name to show during loading]"

For example, the command:
M600 C"Electric Blue"

will show the message:

Insert filament
Electric Blue
and press the knob

and afterwards:

Loading filament
Electric Blue
Please wait
....

[github-actions]

All values in bytes. Δ Delta to base

Target	ΔFlash	ΔSRAM	Used Flash	Used SRAM	Free Flash	Free SRAM
MK3S_MULTILANG	164	0	247900	5653	6052	2539
MK3_MULTILANG	148	0	247198	5662	6754	2530

[3d-gussner]

Everything works as described 🥇

I sliced a small tower with two M600 changes, one without the new C"<String>" parameter and the second one with the new parameter. An additional gcode with a too long C String has been used to verify that the LCD screen doesn't mess up.

Tests on MK404

• MK3S normal
  • first M600 behaves the same as usual
  • second M600 C"Electric Blue" asks and shows correctly that string on LCD screen
  • Too long string M600 C"Prusament PLA GalaxyBlack" is cut to 20 chars and shown on LCD correctly as Prusament PLA Galaxy
• MK3S + MMU3 in Single mode
  • first M600 behaves the same as usual
  • second M600 C"Electric Blue" asks and shows correctly that string on LCD screen
  • Too long string M600 C"Prusament PLA GalaxyBlack" is cut to 20 chars and shown on LCD correctly as Prusament PLA Galaxy
• MK3S + MMU3
  • The C"<String>" parameter isn't shown on LCD as in full MMU mode the user is asked during a M600 to load one of the five filaments.

[3d-gussner]

@Panayiotis-git Thank you very very much for the 4th PR related to this feature and sorry for the additional work you had to put into this PR.

Here few screen shots:

[gudnimg]

Looks good to me