WIP: working on correct connect and disconnect

- move IntList to TestUtils
- make resolve-element for wildcard connections a method (instead of an attribute). would never be a cache-hit anyway
- added Lock in MqttHandler to avoid simultaneous access/modification of AST
- extend base.clean to remove generated aspects as well
3 jobs for 31-ensure-correct-connect-and-disconnect-functionality in 11 minutes and 53 seconds (queued for 4 seconds)