Add wave* and some time* functions

[jminer]

Is this a good way to do unions (MMTIME)? It is similar to how bindgen translated the union.

[retep998]

Use DECLARE_HANDLE!(HWAVEIN, HWAVEIN__);

[jminer]

Fixed HWAVEIN and HWAVEOUT.

[retep998]

I'm not sure how I want to deal with untagged unions. Ideally Rust would get something like rust-lang/rfcs#724 which would makes things way easier. I'm not a fan of those methods returning a *mut instead of a &mut, plus if all you have is an immutable & then you can't access those union members at all.

[jminer]

Yeah, I wish there were language support for C unions. What do you think about having mut and non-mut versions of each member?

    pub unsafe fn ms<'a>(&'a self) -> &'a ::DWORD {
        ::std::mem::transmute(&self.data)
    }
    pub unsafe fn ms_mut<'a>(&'a mut self) -> &'a mut ::DWORD {
        ::std::mem::transmute(&mut self.data)
    }

The methods should probably have an inline attribute too.

[retep998]

There shouldn't be any need to explicitly specify the lifetime in this case as lifetime inference should be enough. Otherwise that approach should work.

[jminer]

Right, thanks. I was thinking that transmute doesn't preserve the lifetime, but I forgot that's irrelevant as the body of a method doesn't affect lifetime elision. I updated the commit.

[retep998]

Do you think you could update this PR to try to make use of the UNION! macro I wrote?

[jminer]

Sure, it's updated. I think using a macro is a good improvement.