* smp server: refactor message delivery to always respond SOK to subscriptions
* refactor ntf subscribe
* cancel subscription thread and reduce service subscription count when queue is deleted
* subscribe rcv service, deliver sent messages to subscribed service
* subscribe rcv service to messages (TODO delivery on subscription)
* WIP
* efficient initial delivery of messages to subscribed service
* test: delivery to client with service certificate
* test: upgrade/downgrade to/from service subscriptions
* remove service association from agent API, add per-user flag to use the service
* agent client (WIP)
* service certificates in the client
* rfc about drift detection, and SALL to mark end of message delivery
* fix test
* fix test
* add function for postgresql message storage
* update migration
* agent: support client notices
* improve
* fix, test
* rename
* cleanup
* send and process notices in more cases
* dont delete
* dont remove notice on other permanent errors
* dont remove notice if there is no notice ID in queue
* add server to error
* allow deleting
* only use notice if key hash matches
* smp server: fix server pages when source code is not specified
* servers: include git commit in version
* flexible alpn
* fix test
* fix ghc 8.10.7 build
* agent: option to use web port by default for preset servers only
* shorten/restore short links in agent, add encodings for SMP web port setting
* decouple preset domains from preset servers for short links
* refactor, rename
* server: support server roles and operators
* make server operator optional
* allRoles
* fix test
* different server host in tests
* remove ServerCfg fields used only in UI
* comments
* choose different server for invitation when connecting via address
* fix test in ghc8107
* simplify
Evgeny