Conflicts:
cura/CuraApplication.py: Setting version
fdmprinter and fdmextruder: Setting version
intents, qualities and variants: Setting version
Changelog: 4.9.1 was added, should be below Arachne changes
Some contributors seem to have a shift key stuck here or there. Many 'stylised' capitalisations weren't reflected even on the manufacturer's websites, or were also stylising words like 'pro' and 'dual' or even actual chemical names like 'nylon'. Normalising the caps makes it more fair for everyone, since all of these are written in the same font.
As discussed with the Cura team.
Context: Print Thin Walls and Fill Perimeter Gaps are old settings that aren't needed any more since we switched to libArachne (Varianble Line Widths).
CURA-7148
Since by default it now defines a value for this one rather than default_value, this override had broken. Thank you, tests.
Contributes to issue CURA-6860.
