Respect the quicklook controller stuff.

Make semantic history perform secure copy.

Add quicklook support for images, URLs, and scp.

Fix a bug where force touch actions got done many times.

Add intelligence to guess if a VT100RemoteHost is actually the localhost so we don't try to scp from
localhost.

Keep quicklook in sync with the current session, so each session can have a different quicklook
item.