ConversationClient method for message deletion
Subtask of #68 (closed)
-
Add ConversationManager
method for deleting all conversation messages which delegates to conversation clients -
Add ConversationClient
method for deleting all messages that returns true if all messages were delete or false if not (because they are invitation/introduction messages that can't be deleted). -
Add real implementation for MessagingManager
, no-op implementations for other clients (just return false)