Remove offensive language (Pt. 4)

[Holzhaus]

This is part of #11931 and contains mostly tooltip and skin changes, as well as replacing some remaining occurrences.

[Holzhaus]

Do we need an alias system for tooltip IDs for backwards-compat with third-party skins? I hope not.

[ronso0]

I don't think so. Would be nice to have, but the effort is not worth it IMO. There's a skin warning logged in case of 'invalid' tooltip ids (which needlessly contains the entire file path of legacyskinparser.cpp).
What might be helpful for 3rd-party skin users/developers would be a link to the respective tooltip migration commit (in the changelog maybe?), because, for tooltip ids, we probably won't have something like the 'deprecated, use XX instead' hint in manual > Mixxx controls, it's too much effort and tbh I don't know where to put that so it's actually more discoverable than a link in the changelog.

Whta do you think?

[ronso0]

Apart from that the changes LGTM (as good as they can when looking at a diff of 112 files ;), and I'm now checking the skins for obvious regressions.

[ronso0]

Btw, wouldn't it be better to move this to a Mixxx repo/branch?

[ronso0]

Thank you, LGTM