Use windows crate instead of winapi

[ssssota]

close #51

The existing tests passed, but I am a beginner in this area, so I have not been able to fully verify the validity of the changes.

[jdm]

Do you have a Windows environment to test these changes? If so, can you try making a build of Servo that uses this branch and verify that it still loads pages and displays text?

[ssssota]

@jdm
I tried to build Servoshell, but it won't work immediately because the PR includes a breaking change in the interface (Result<(), winapi::um::winnt::HRESULT> -> Result<(), windows_core::HRESULT>, etc.). To what extent should the interface be maintained?