WIP - Add positions to mouse click events.

[icefoxen]

For the sake of argument. And catharsis. Addresses issue #883 for some platforms, so I can see how much work it actually takes. Not implemented for macos 'cause I don't have a way to test it.

• [ ] Tested on all platforms changed -- Haven't tested on Windows yet.
• [x] Compilation warnings were addressed
• [x] cargo fmt has been run on this branch
• [x] cargo doc builds successfully
• [ ] Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• [ ] Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• [ ] Created or updated an example program if it would help users understand this functionality
• [ ] Updated feature matrix, if new features were added or implemented

[chelmich]

Tested on Windows 10. Works as intended.

[M-Adoo]

Any progress on this?

[daxpedda]

I will close this as it's unmaintained and needs a serious rebase after #2662. Would be happy to review a renewal!

Continues to be tracked in https://github.com/rust-windowing/winit/issues/883.