WIP: Add parts of Sentinel1 Metadata reading process.

...ne/OTB/Files/ioTvImageMetadataInterfaceTest_Sentinel1.txt

Modules/Core/Metadata/include/otbGeometryMetadata.h

Modules/Core/Metadata/include/otbMetaDataKey.h

...ore/Metadata/include/otbSentinel1ImageMetadataInterface.h

Modules/Core/Metadata/src/otbGeometryMetadata.cxx

Modules/Core/Metadata/src/otbMetaDataKey.cxx

.../Core/Metadata/src/otbSentinel1ImageMetadataInterface.cxx

Modules/Core/Metadata/test/CMakeLists.txt

Modules/Core/Metadata/test/otbImageMetadataInterfaceTest.cxx

Modules/Core/Metadata/test/otbMetadataTestDriver.cxx