ENH: switch envisat model to ossim plugins

...tbossim/src/ossim/imaging/ossimImageHandlerSarFactory.cpp

...otbossim/src/ossim/projection/ossimSensorModelFactory.cpp

...simplugins/ossim/EnvisatAsar/AntennaElevationPatterns.cpp

...ossimplugins/ossim/EnvisatAsar/AntennaElevationPatterns.h

...ies/otbossimplugins/ossim/EnvisatAsar/ChirpParameters.cpp

...ities/otbossimplugins/ossim/EnvisatAsar/ChirpParameters.h

...implugins/ossim/EnvisatAsar/DopplerCentroidParameters.cpp

...ssimplugins/ossim/EnvisatAsar/DopplerCentroidParameters.h

...ies/otbossimplugins/ossim/EnvisatAsar/EnvisatAsarData.cpp

...ities/otbossimplugins/ossim/EnvisatAsar/EnvisatAsarData.h

...ossimplugins/ossim/EnvisatAsar/EnvisatAsarDataFactory.cpp

...tbossimplugins/ossim/EnvisatAsar/EnvisatAsarDataFactory.h

...s/otbossimplugins/ossim/EnvisatAsar/EnvisatAsarRecord.cpp

...ies/otbossimplugins/ossim/EnvisatAsar/EnvisatAsarRecord.h

...simplugins/ossim/EnvisatAsar/EnvisatAsarRecordFactory.cpp

...ossimplugins/ossim/EnvisatAsar/EnvisatAsarRecordFactory.h

...ies/otbossimplugins/ossim/EnvisatAsar/GeolocationGrid.cpp

...ities/otbossimplugins/ossim/EnvisatAsar/GeolocationGrid.h

...simplugins/ossim/EnvisatAsar/MainProcessingParameters.cpp

...ossimplugins/ossim/EnvisatAsar/MainProcessingParameters.h