Actor send_message timeout is too short

[thelabcat]

The actor needs to wait between sending messages, so Rumble will not flag it for sending too many messages too fast.

Proposed solution:

• Add an outbox that the send_message method adds to
• Add a thread that handles sending outbox messages at correct intervals

[thelabcat]

• The send message cooldown seems to be 3 seconds or less, so let's use that.
• The cooldown should automatically reset if the bot sees that the account it is using has sent a message.
• This plan could also make timed messages safer.