Dynamic configuration

[svenreimers]

Is your feature request related to a problem? Please describe.
For a faster turnaround and for a simpler lifecycle for changing configuration properties, the configuration of the wall shall support non final configuration object and values.

Describe the solution you'd like
Not all of the objects/values may need to support changeability, but the general concept needs to
implemented. A possible solution is a the retrieval of config object from a facade (no new anymore for those dynamic objects), so that behind the scenes some wiring for changeability can be done (changes are applied form within the configuration). An configuration change accessor object could be provided, e.g. similar to ReadOnly and ReadWrite views of JavaFX properties.