gui bug fixes
add explicit default precision for WV shaders
handle zmq message after websocket is closed in ZMQStreamServer
add try/except handling to project import handler
re-disable view_csm test on pangolin
Merge branch 'dev' into gui
fix problem with multiple ws_closed dialogs at same time during gui testing
misc gui test tweaks and PEP cleanup
Merge pull request #1446 from swryan/gui

gui - bug and test fixes