queue messages during login and send them afterwards
queue messages during login and send them afterwards

Directly sending out any message sent by GSJS code causes client-side
errors during the (re)login process (see https://trello.com/c/FhXrtwJ5);
just dropping them causes other problems (https://trello.com/c/UFPduR2B).
Therefore, let's try queueing them up and sending them out at once, in
FIFO order, after the (re)login has finished.

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