Fix possible concurrency issues with listener registrations #229
+9
−9
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The main reason for this PR is the possibility of concurrent modifications in List/Set implementations which do not support that. Whether there is a real concurrency issue depends on the users of the public methods. However, the LoxoneState.onLoxoneApp(LoxoneApp) method is definitively questionable, since it adds a listener inside of a running listener, running in an unknown pooled thread.