Propose removal of Oembed field

First of all... its broken. And nobody has reported a bug for this - so I suspect nobody is using it!

But I'm not sure about the whole concept of this field. WordPress converts oEmbed compatable URL to embed codes on output. But this field does it on save, and stores the full embed code. 

This is much easier if you don't really know what you're doing. But I think it would make more sense to use a text/code field and do the oembedding out output. We could document that this field was removed and provide an example of how to oembed on output.

Would love to know if anyone is actually using this field. If they are, i'm happy to fix it up. Any thoughts @willmot @joehoyle