[Enhancement] `global_parameters` class
At the moment the global parameters are an array where all needed parameters are just appended. This is prone to failure, since you always have to keep track of positions for the parameters of your desired process.
global_parameters class, where every process can register the parameters, init-values and ranges used in optimization.
These registrations could than be accessed by registration IDs (for example).
The current behavior, to be represented as an array could be provided by a class-method.