[WIP] Add component for queuing messages.

All incomming messages are kept in memory. As soon as the queu reaches the
pre-configured size of 100 messages, the current list of messages is send.

You can reconfigure the queu size of the component by sending a message to
the `size` input port of this component. If the incomming data is not a
positive integer, an error message will be send to the `err` out port of this
component.

TODO
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There are no tests yet. How would we best create a set or reasonable unit tests for the different components?