ENH: find ossim the cmake way

CMake/FindOssim.cmake

CMake/ImportOssim.cmake

.../UtilitiesAdapters/OssimAdapters/otbAeronetFileReader.cxx

.../UtilitiesAdapters/OssimAdapters/otbDEMConvertAdapter.cxx

Code/UtilitiesAdapters/OssimAdapters/otbDEMHandler.cxx

Code/UtilitiesAdapters/OssimAdapters/otbEllipsoidAdapter.cxx

...pters/OssimAdapters/otbGeometricSarSensorModelAdapter.cxx

Code/UtilitiesAdapters/OssimAdapters/otbImageKeywordlist.cxx

...ilitiesAdapters/OssimAdapters/otbMapProjectionAdapter.cxx

...tiesAdapters/OssimAdapters/otbPlatformPositionAdapter.cxx

...ilitiesAdapters/OssimAdapters/otbRPCProjectionAdapter.cxx

...UtilitiesAdapters/OssimAdapters/otbSensorModelAdapter.cxx