disable/toggle scrollbars

	* add flag to main
	* add flag to manual
	* add signal handler to block default scrollbar policy
	* add toggle of scrollbars (hacky - but no reload) with a twitch
	* add key map to manual
	* add commandline flag to children surfers
	* update TODO
	* sort stuff alphabetically for the style inquisition

Signed-off-by: Christoph Lohmann <20h@r-36.net>