STOMP package

I have added a new package stomp to the default package set. The STOMP protocol allows you to connect to server message brokers, among which RabbitMQ. The package, based on the initial work by @honnix will be part of the default installation as of version 8.3.27. Together with RabbitMQ you can setup reliable message passing with load balancing and fall over in minutes. The round-trip time for a trivial message is about 0.2 millisecond (localhost, Ubuntu 20.04 on AMD 3950X).

If you want anything changed, this is the time to ask for changes!