Exploration.alg: Remove the SystemModelAdapter from the inner DSE core [1/2].

* Remove the SystemModelAdapter from many inner constructor methods where it is not needed or can be substituded by other information/data sources.
* Introduce the InitialEncodingProvider that provides encodings to inner DSE parts iff an encoding can be constructed from the input models and if no other Exploration Feature provides the required encoding.
refs 2962