UI coding, Core class modelling

Signed-off-by: Luaidh <Marin.Althuis@t-online.de>
Merge branch 'master' of https://github.com/ar7u9o/media-library

Conflicts:
	MediaLibrary/Models/Core.classdiagram
	MediaLibrary/Models/Core.classdiagram.layout
	MediaLibrary/Models/ModelDefinition/Models.uml