Remove redundant API taking x,y pair instead of sf::Vector

[ChrisThrasher]

Thanks a lot for making a contribution to SFML! 🙂

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• Has this change been discussed on the forum or in an issue before?
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Description

Expanding on @vittorioromeo's work in #1902. I removed a few more instances of (x, y) pairs in APIs alongside sf::Vector variants. I grep'd around the repo for as many instances of this pattern as possible and couldn't find any more other than some sf::Image APIs that have no sf::Vector counterpart (but maybe should).

The biggest changes were in sf::Transform which have no tests but I have a branch where I'm starting to test it. Happy to submit a PR for the tests I've added so far but there's plenty more work to go there.

Tasks

• Tested on Linux
• Tested on Windows
• Tested on macOS
• Tested on iOS
• Tested on Android

[vittorioromeo]

LGTM, thanks. Let's see what CI thinks...