ENH: fix warning, enum in namespace

Code/Projections/otbEckert4MapProjection.h

Code/Projections/otbEckert4MapProjection.txx

Code/Projections/otbGenericMapProjection.h

Code/Projections/otbGenericMapProjection.txx

Code/Projections/otbGenericRSTransform.h

Code/Projections/otbGenericRSTransform.txx

Code/Projections/otbGeocentricTransform.h

Code/Projections/otbGeocentricTransform.txx

Code/Projections/otbLambert2EtenduProjection.h

Code/Projections/otbLambert2EtenduProjection.txx

Code/Projections/otbLambert3CartoSudProjection.h

Code/Projections/otbLambert3CartoSudProjection.txx

Code/Projections/otbLambert93Projection.h

Code/Projections/otbLambert93Projection.txx

Code/Projections/otbLambertConformalConicMapProjection.h

Code/Projections/otbLambertConformalConicMapProjection.txx

Code/Projections/otbMapProjection.h

Code/Projections/otbMapProjection.txx

Code/Projections/otbMapProjections.h

Code/Projections/otbMollweidMapProjection.h