proto: full service message support

[tdakkota]

https://core.telegram.org/mtproto/service_messages

Service Messages

• [x] Response to an RPC query
• [x] RPC Error
• [x] Cancellation of an RPC
• [x] Request for several future salts
• [x] Ping Messages (PING/PONG)
• [x] Deferred Connection Closure + PING
• [x] New Session Creation Notification
• [ ] Request to Destroy Session

Service Messages about Messages

• [x] Acknowledgment of Receipt
• [x] Notice of Ignored Error Message
• [ ] Request for Message Status Information
• [ ] Informational Message regarding Status of Messages
• [ ] Voluntary Communication of Status of Messages
• [x] Extended Voluntary Communication of Status of One Message
• [ ] Explicit Request to Re-Send Messages
• [ ] Explicit Request to Re-Send Answers

Containers

• [x] Simple Container
• [ ] Sending Simple Container (#392)
• [x] ~~Message Copies~~ (this is not used at this time)
• [x] Packed Object

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ernado]

@stale не хулигань