ENH: Adding a filter to produce a vector data of the envelope of an image

Code/Projections/otbImageToEnvelopeVectorDataFilter.h

Code/Projections/otbImageToEnvelopeVectorDataFilter.txx

Code/Projections/otbVectorDataProjectionFilter.h

Testing/Code/Projections/CMakeLists.txt

...g/Code/Projections/otbImageToEnvelopeVectorDataFilter.cxx

Testing/Code/Projections/otbProjectionsTests4.cxx