Add support for <tfoot>

[ASmyth]

Could you guys add support for <tfoot>? I know that it is not a big deal but it would both be more accurate and look better. The tfoot tag is just ignored so it looks like it is not even there. Currently, my tables look like this in code even though the last row is inside a tfoot:

[ben]

@ASmyth, Arnold, you need to vote for this as well.

[Teodor]

You can see the common HTML elements in the DOM panel.

[ben]

Yes, but it looks better if properly labeled in the App Structure,