Changeset 17446 for branches/3026_IntegrationIntoSymSpace/HeuristicLab.PluginInfrastructure

#3026:

• made interfaces for array/matrix JsonItems and for their VMs aswell (IArrayJsonItem, IArrayJsonItemVM, IMatrixJsonItem, IMatrixJsonItemVM), incl. base classes (ArrayJsonItemBase, ArrayValueVM, MatrixJsonItemBase, MatrixValueVM)
• changed inheritance structure for already existing array/matrix JsonItems -> they inherit now from new base array/matrix base classes
• added input elements to configure the size of an matrix or array in JsonItemMultiValueControl (incl. VM binding and validation)
• splitted file JsonItems.cs into separate files for their corresponding types (IntJsonItems.cs, DoubleJsonItems.cs, BoolJsonItems.cs, StringJsonItem.cs, DateTimeJsonItem.cs)
• changed location of deserialization of json values from JsonTemplateInstantiator into IJsonItem (implemented in JsonItem and set to virtual, overridden in MatrixJsonItemBase and ArrayJsonItemBase)
• added new CLI argument StringArgument
• some little UI improvements (location fixes, anchor fixes, ...)