fix bug that occur because clients were assuming mutual dataChannel connections when that is not always true (client B can't assume it can message client A even if it has received a message from client A already)

fix bug where joystick input in rift would drop objects; fix bug where media loader objects loaded for the first time lose their physics shape

fix issue with pen not drawing until second primary_grab; fix spawn_pen-hover icon; enable spawning pen from in-world-hud; re-enable personal space bubble as default

add ability to spawn pen from hud (replacing the space bubble toggle); disable space-bubble as default