Merge branch '31-ensure-correct-connect-and-disconnect-functionality' into 'dev'

Ensure correct connect and disconnect functionality

- move IntList to TestUtils
- make resolve-element for wildcard connections a method (instead of an attribute). would never be a cache-hit anyway
- extend base.clean to remove generated aspects as well
- fixing imports
- introduced new types to encapsulate behaviour: RagConnectTokenMap, RagConnectPublisher
- move lastValue (of sendDefinitions) into new publisher
- create connectToken outside of handlers
- MqttHandler:
  - make wildcardPatterns a list
  - added Lock to avoid simultaneous access/modification of AST
- RestHandler: update dependency requirement to Spark 3.9.3 in order to unmap existing routes upon disconnect
- testing disconnect functionality in (most) existing tests

Closes #31

See merge request !12