Expand M550 G-Code to have an option for the mDNS/NetBIOS name

[t0bias]

It would be nice to have the M550 G-Code in a way where additionally to the name, another parameter for the mDNS/NetBIOS name could be added for use with longer printer names that would otherwise just be chopped off.

Something like this:

M550 P"MyLongPrinterName" S"LongPrinterName"