I hope that the machine node doesn't become a collection of functions that don't fit anywhere else, but this isn't contributing to that hope. However I still think that this is particular to a certain printer, so it's within the object-oriented programming paradigm. And it's also within the scope of the class, which is getting the available profiles. So it still sort of fits.
Contributes to issue CURA-6600.
Cast every sorting key to uppercase before doing this. Don't cast to lowercase or there will be problems with characters that don't have lowercase and with Turkish dotted i vs. undotted i.
Fixes#3460.
