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Add option to mention room

See merge request !3

* wait for initialization to finish before serving requests
* wait for promises to resolve (or throw) before returning result
* catch failed promises and show error to the caller

If not already joined.

Add default port for docker image.

See merge request !1

Matching exposed port

This update fix a lot of issue (like https support) and without impact on the code

Also start adding tests.

For example due to getting muted in a room.