Load Data from DataConnector

[psychocoderHPC]

We need a small interface change to support multi species in the future.
At the moment we load data from DataConnector with DataConnector::getInstance().getData<T_TYPE>(id,..).
Can we exchange the integer id with a unique string? At the moment we need a central place were we define unique ids (a enum in simulation_types.hpp), this means with multi species we must describe species in one param file and for every species we must change the global id enum per species. This are two places which must be changed to add a species.
Every species and field has a unique name, we should use this name to identify datasets.
e.g.

DataConnector::getInstance().getData<FrameType>(FrameType::getName(),..);
DataConnector::getInstance().getData<FieldB>(FieldB::getName(),..);

If we define that every dataset must have a static getName() method than we can fully skip the name from the interface and call the getName() method inside of the DataConnector to create a map were the key is the name.

DataConnector::getInstance().getData<FrameType>(..);
DataConnector::getInstance().getData<FieldB>(...);

IMO we can combine the interface change with #114

[f-schmitt]

I would like to integrate this as a separate pull since it is not directly related to #114 and I find it to be cleaner if we have smaller oull requests.

[ax3l]

👍 absolutely

[f-schmitt]

Closed with #232