GL::Shader::Object: fix move/copy constructors/assignment operators
GL::Shader::Object: fix move/copy constructors/assignment operators

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3