[filter] kill stickiethingies

[StommePoes]

Sticky headers, sticky footers, sticky social-media BS containers, and position: fixed modal dialogs, kill them aaaaaaall.

[erikkroes]

No overflow:hidden on the body goes with this right?

[StommePoes]

That should be left with the other ticket about overflow. Most stickies are simply sticky and they can't scroll due to position:fixed, not due to overflow