Remove DRAMSysRecordable.h/cpp as the functionality has been incorporated into
DRAMSys.h/cpp. The databaseRecording config is now completely handled by
DRAMSys itself without needing the user of the library to instanciate DRAMSys
or DRAMSysRecordable depending on this config.
The configuration library has been refactored to make use of nlohmann
macros to reduce boilerplate code.
The nlohmann parser callback is used to decide whether to include
configuration json objects directly, or if they need to be loaded
from a sperate file.
