v0.9.1-beta.4

• marirunner.py for Marigold Depth Estimation (see #9). Have Marigold/ under depthpy/ and run python depth.py -r mari -t Bingxin/Marigold --optimize.
• ZMQ parameter setting commands: set_zmq_timeout, set_zmq_fail_tol.
• The Unity program checks depth_map_type in the metadata of .depthviewer.
• enqcmd_after for delayed cmd queueing -- replace sleep 5000 \n zmq_id 5556 with enqcmd_after "zmq_id 5556" 5000.