13833 rename String>>#withFirstCharacterDownshifted to String>>#uncapitalized
�� https://pharo.fogbugz.com/f/cases/13833

I added two more issue to make that transition easier...��

(for the critic, we should have a "Pharo3 to Pharo4 porting" section)

14019 add critics rule for #withCaracterDownShifted -> #uncapitalized

14018 backport #uncapitalized to Pharo3