Added EELS search filters into the GUI (resolution, energy_window, detector_type, eels spectrum)
Fixed issue in parser not reporting units for energies
Updated the experimental metainfo for device settings to include units and small description.
Added new EELS metadata into results together with regtests
Small GUI refactoring for the process of serializing/deserializing filter values (was needed for serializing energy_window which does not correspond to a single metainfo quantity)
Small GUI refactoring for the components used to display properties in the overview (PropertyCard, PropertyContent).
