Release version 0.7
ws: Make the HTTP parts of cockpit-ws log in cockpit-protocol domain

This lets us focus in on the semantic stuff, and leave the
mechanical shunting of bytes into the cockpit-protocol log domain.

Closes #572
Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>
ws: Fix race when disconnecting from an ssh transport

Closes #574
Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>
static: Serve static files from a separate directory

These are files that will remain unauthenticated and retrieved
directly from the server connected to.

These files are served in such a way that they are cached for
a year, and not refreshed. They must be renamed when they are
updated.

Closes #561