Potentially Renaming Dataset Classes

[Kaszanas]

currently the SC2EGSetDataset class takes an additional argument that specifies the available_replaypacks. This behavior is more alike to a generic class that could more than just this given dataset. Therefore, it may be renamed and the SC2EGSetDataset class could be left with a deprecation notice and ultimately be discarded at some point.

[Kaszanas]

Similar issue is there for providing names_urls keyword argument to this class, by default this class should be self-evident and always contain the data from the Zenodo repository. This interface should be verified.