[LMU Apps] GUI Improvement

[Andreas Janz]

Use QgsMapLayerComboBox widget for selecting a raster.

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All input and output files should be QgsFileWidget.

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[Fabian Thiel]

Just adding to this: There seems to be a glitch in the spectrum of the EnMAP Sensor (seems to occur across multiple/all models)

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[Andreas Janz]

Das ist doch die “EnMAP-Schleife”