* process ntf server commands
* when subscription is re-created and it was ENDed, resubscribe to SMP
* SMPClientAgent draft
* SMPClientAgent: remove double tracking of subscriptions
* subscriber frame
* PING error now throws error to restart SMPClient for more reliable re-connection (#342)
* increase TCP timeout to 5 sec
* add pragmas and vacuum db (#343)
* vacuum in each connection to enable auto-vacuum (#344)
* update protocol, token verification
* refactor SMPClient to ProtocoClient, to use with notification server protocol
* notification server client, managing notification clients in the agent
* stub for push payload
Co-authored-by: JRoberts <8711996+jr-simplex@users.noreply.github.com>