XPLANBOX-2519 - use files referenced in XPlanGML instead of using GDAL

.../main/java/de/latlon/xplan/manager/edit/ArtefactType.java

...ain/java/de/latlon/xplan/manager/edit/EditedArtefact.java

...in/java/de/latlon/xplan/manager/edit/EditedArtefacts.java

.../de/latlon/xplan/manager/edit/ExternalReferenceUtils.java

...in/java/de/latlon/xplan/manager/edit/RasterReference.java

...de/latlon/xplan/manager/transaction/XPlanEditManager.java

.../latlon/xplan/manager/transaction/XPlanInsertManager.java

...on/xplan/manager/transaction/XPlanTransactionManager.java

.../xplan/manager/wmsconfig/config/RasterStorageContext.java

...de/latlon/xplan/manager/wmsconfig/raster/RasterUtils.java

...on/xplan/manager/wmsconfig/raster/XPlanRasterManager.java

...an/manager/wmsconfig/raster/access/GdalRasterAdapter.java

...n/manager/wmsconfig/raster/storage/FileSystemStorage.java

...n/manager/wmsconfig/raster/storage/GdalRasterStorage.java

...xplan/manager/wmsconfig/raster/storage/RasterStorage.java

.../manager/wmsconfig/raster/storage/s3/S3RasterStorage.java

...aster/storage/s3/config/AmazonS3RasterStorageContext.java

...c/test/java/de/latlon/xplan/manager/XPlanManagerTest.java

...tlon/xplan/manager/document/XPlanDocumentManagerTest.java

...latlon/xplan/manager/edit/ExternalReferenceUtilsTest.java