to do that, refactor redraw_tab and split redraw_body out of it

* rework response code handling * support 10/11 input requests * load a url from minibuffer * edit current url and load it from minibuffer

It's easier to allow the stopping of not-existent requests rather than track which tabs have still ongoing connections and what not and handle this bit of logic in the UI.

close_with_err does a close_conn which in turns drops req from the queue. Thus it crashes on error, avoid that.