DONT do a new protocol revision - its weird. Instead, scrap ping and repeat window frame to help keep alive connection, and use data frame version for partial ack support detection, which provides even MORE backwards compat than before
Fix compile error
- version bump to 0.0.20
- remove zeromq because it's not used yet.
Fixed imported but not used
Remove unused variable
Merge branch 'master' into protocol_improvements_and_server_client_improvements
Merge branch 'protocol_improvements_and_server_client_improvements' into driskell_merge_pr164