Add VectorSink

[orangefour]

✅ T::traits_type::char_type char_type → T::value_type (all STL containers have this)
✅ sizeof(output[0]) → sizeof(value_type) (works with any containers, not just random access)
✅ append → insert (more universal)
✅ simple unit test

🚀 VectorSink typedef

[noloader]

Thanks @orangefour. Hat's off for the test cases :)

Would you be able to whip up a VectorSource to accompany the VectorSink?

[orangefour]

I tried to implement VectorSource in a nice way but it needs a little bit more time. It would be nice to see VectorSink accepted first 😉

[anonimal]

Status?

[orangefour]

I have fixed conflicts, it would be nice to see this pull request accepted.

[mouse07410]

It's been almost a year. @orangefour would you care to rebase to the current master? @noloader if this PR is rebased, would you accept it for merge?

[noloader]

@mouse07410,

I was hoping for both VectorSource and VectorSink. If you like it then feel free to merge it.

[mouse07410]

I'm waiting for the author to resolve conflicts first.

And it would be nice if the author could commit to writing VectorSource as well. But I think it's ok if we merge Sink first, as long as Source would follow.

[orangefour]

I will try to find time for VectorSource, but please merge VectorSink first. I fixed conflicts and cleaned up everything to a single commit

[mouse07410]

@orangefour I'm merging this PR, thanks for contributing. I do hope that you do find time for VectorSource, as it's been the tradition of this library to provide both Source and Sink.