[properties] replace BEGIN/END_PROPERTIES macro calls

examples/lens_richards_ecfv.cpp

@@ -32,7 +32,7 @@
 
 #include "problems/richardslensproblem.hh"
 
-BEGIN_PROPERTIES
+namespace Opm::Properties {
 
 // Create new type tags
 namespace TTag {
@@ -43,7 +43,7 @@ SET_TAG_PROP(RichardsLensEcfvProblem, SpatialDiscretizationSplice, EcfvDiscretiz
 //! Use automatic differentiation to linearize the system of PDEs
 SET_TAG_PROP(RichardsLensEcfvProblem, LocalLinearizerSplice, AutoDiffLocalLinearizer);
 
-END_PROPERTIES
+} // namespace Opm::Properties
 
 int main(int argc, char **argv)
 {