Update to windows-sys 0.59

[valadaptive]

The biggest change is that handle types are now *mut c_void instead of isize. In particular this means we must wrap the HWND in the Window struct to make it Sync. I've changed the public winit::platform::windows::{HWND, HMONITOR, HMENU} type aliases to match.

See rust-windowing/raw-window-handle#171. From my understanding, while handles may technically be integers, everyone in charge of actually defining the API surface really wants them to be pointers and it's best to just go with it.

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• [n/a] Created or updated an example program if it would help users understand this functionality