Multiple fixes. Closes #24; Closes #30

 - Fix #24: make 'Auto' a checkbox
 - Fix #30 via habitat-cpp-connector submodule: squid proxies
 - Remove 'Test' prepended to update message.
Upload the frequency that the rig is tuned to, if available
Also upload the audio frequency
Get rig info straight from rig software to keep it fresh.
Reduce use of AutoLock where possible. Avoid deadlocks when threads die during shutdown.
Add new cpp-connector commits
Update to latest habitat-cpp-connector