* ntf: use separate key to encrypt NMsgMeta
* key negotiation
* save key on server, use for encryption
* refactor?
* store error
* NtfQueueCreds
* server - NtfCreds
* comment, rename
* fix type
* ClientNtfCreds
* encoding
* support stopping and resuming agent (#385)
* export agentDbPath
* support fully closing and resuming agent
* whitespace
* clean up
* support message flags visible to SMP server to control notifications (and for any future extensions)
* simplify message flags encoding
* GET command
* notifications: periodic notifications
* agent: allow repeat token registrations, delete old tokens from notification server (e.g., when database is moved to another device)
* decrypt token verification code in the agent
* check token status, send TCRN on registration if it was enabled
* fix http2/apns response handling for error responses (also, APNS seems not to send content-length header?)
* agent schema/methods/types/store methods for notifications tokens
* register notification token on the server
* agent commands for notification tokens
* refactor initial servers from AgentConfig
* agent store functions for notification tokens
* server STM store methods for tokens
* fix protocol client for ntfs (use generic handshake), minimal server and agent tests
* server command to verify ntf token
* notifications: protocol
* update protocol to include subscription ID and DH public key
* update protocol, started server
* add notification server subscription DH key
* use the same command type in notifications protocol, protocol parsing, server frame
* remove empty files
* make sending confirmation asynchronous
* confirm first queue synchronously (on JOIN, and delete connection on failure), second queue asynchronously (from REPLY msg)
* test to retry JOIN when the first attempt fails
* process confirmation delivery errors
Evgeny Poberezkin