* Added new "identifier" attribute in JSON metadata files
* "identifier" is now the one that makes plugins unique
* "name" attribute is a human-readable name
refs #404, and discussion https://dev.vatsim-germany.org/issues/404#note-8
* Changed CSimulatorSetup to use CNameVariantPairList as data. The old version was an hack and had to go, CNameVariantPairList would allow complex types in the future and can be already shown in the GUI.
* CNameVariantPairList was improved slightly in the same step
* Functions to get CSimulatorSetup from driver / context
* Removed CSimulatorSetup data from CSimulatorPluginInfo