Pipes hotfix, collaborative mode (beta), font smoothing

• enabled fonts smoothing
• modified disconnect button tooltip
• removed pipes messages size limitation
• pipes are no longer buffered
• added support for multiple websockets on a single remote session to allow for collaborative mode (was already supported using long-polling). To share a remote session, simply copy and share the session url (contains the session id). CAUTION! this is experimental (no access control, no presenter role, etc.)
• enforced wfreerdp process identity on pipes access rule
• pipes are now used in byte mode instead of message (small performance improvement)
• remote session is now closed in case of pipes failure instead of being stuck