When using ToJSON attribute to export metadata, the order the metadata
are exported depends on the platform. This is not a problem when
working with metadata, but the test (as they are currently made) need
a constant order of the metadata in the output file.

REFAC: update multi-baseline for large input tests (same projection, but different wkt strings) and removed out-of-date baselines

REFAC: Implement the methods ToKeywordlists, ToBandKeywordlists and FromKeywordlists for the class Metadata

PERF: use the move function in the constructors, remplace std::atoi by boost::lexical_cast, use boost::bimap for MDL1DBmType and MDL2DBmType, complete the implementation of ImageMetadataBase::ToKeywordlist for the LUT, use otb::Join

REFAC: LUT1D and LUT2D can now serialize. ToKeywordlist updated to use serialized LUT. Fixed typo Axes to Axis

REFAC: Implementing ImageMetadataBase::FromKeywordlist for StringKeys, NumericKeys, TimeKeys and ExtraKeys. Convertinf the corresponding MDNames to boost::bimap. Fixed missing values in MDNumNames and MDStrNames

REFAC: Implemented parts of the GeometryKeys conversion for ImageMetadataBase::ToKeywordlist. Implemented OTB_GCP, GCPParam and RPCParam.

BUG: updated multi baselines for ioTvMultiDatasetReading 1 and 2, 'Not specified based on custom spheroid' is not formatted is the same way between different gdal versions

TEST: added multi baseline for ioTvMultiDatasetReading tests when using gdal3 (projection layout is different)

BUG: check geometry validity before computing intersection to avoid errors due to self intersecting polygons in geos 3.8