Added some user message handlers

Handlers now exist for user creation, auth, state messages, and post
messages. Still need to do group permissions and messages

confetti.toml.example

@@ -8,6 +8,10 @@ media_directory = "/srv/confetti/media"
 statefile = "./confetti.state"
 loglevel = "debug"
 max_message_len_kb = 10000
+# List of users with server-level permissions that are allowed to change anything in
+# any room
+# admins = ["alice"]
+admins = []
 # Optional
 # account_creation_code = "password1"