#37 added basic functionality to MapExportPanel
#37 MapExportPanel: changed appearance
#37 dpis are loaded from the xml and considered when saving to file
#37 i18n of strings
#37 made MapExportPanel.ExportMapToFileAction work properly
#37 use the dpi also in the export to the clipboard
#37 MapExportPanel: choose the world file extension depending of the file format
#37 use a multiple download to download the map and the world-file
#37 moved inner classes GeoLinkUrl and ImageSelection from CismapPlugin to own files
#37 Major refactoring of the export map classes. Moved them from MapExportPanel to own classes. The connection between the two classes is realized via an interface ExportMapDataProvider
#37 created an Enum ExportMapFileTypes which represents the valid file types which can be used
#37 in ExportMapToFileAction make use of the Enum also to get image file extension
#37 added get getHttpInterfacePort() to CismapPlugin
#37 created DefaultExportMapDataProvider
#37 added standard constructors to AbstractExportMapAction and its subclasses
#37 use the export map actions also in the menu of CismapPlugin
#37 removed code from CismapPlugin, which is no longer needed
#37 FutureImageDownload was renamed
#37 in MapExportPanel and DefaultExportMapDataProvider use the httpInterfacePort of cismap plugin
#37 better German text