Unify `Cursor` and `Pointer` nomenclature

[janhohenheim]

What problem does this solve or what need does it fill?

Picking talks about Pointers, Window talks about Cursors. Shouldn't they use the same terminology?

What solution would you like?

Pick one or the other. Or a secret third option!

What alternative(s) have you considered?

Leave it as-is

Additional context

Brought up by @ickshonpe in #19668 (comment)

[IceSentry]

This was discussed a bit in discord. Here's the TLDR "A pointer is any pointing device, cursor usually means the single cursor rendered by the OS. There is usually only one cursor, but many pointers.". Some use of "cursor" will need to be updated once winit releases with rust-windowing/winit#3876

I don't think there's anything else to do other than maybe adding docs about this somewhere?