* test notification token with agent and notifications server
* notification server test with APNS mock
* set environment variables in the test
* use base64url encoding in encrypted notification data
* 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?)
* APN push client (WIP)
* APNS push client works
* TODO comments
* comment
* send notification and process the response
* config
* e2e encryption for notification parameter
* read apns key filename and ID from env
* connect APNS client to server, fix notification JSON encoding to use dash case
* do not connect to APNS on start to pass CI tests
* fix CI test
* remove redundant import