Previously, the meeting class was determining Dialable based on a meeting ID being "0". This is a Zoom-specific thing, but it has recently become a thing for Cisco codecs to have meetings that aren't necessarily dialable. Adding this property to the `Meeting` class allows the specific codec type to set it correctly based on that codec's needs.
In order to support the way some Smart Objects work, a clear
directory join was needed in order to allow for clearing a
selection in certain circumstances.
In order to support finer-grained dependencies while
developing plugins, the Development Device Factory was added.
Update to poll meetings every 60 seconds
Add property to allow for adjusting when Join button appears
Refactor call connected event handler
Adjust text for header for sharing-only meeting
Add logic to handle waiting for host state
