Improve handling of external smesh

+ add SMESH_version.h.cmake to set full version number instead of using compiler define
+ do not set include path of smesh globally
+ do not set library path of smesh globally
+ do not set HAVE_NETGEN define globally
+ improve using debug and release libs of smesh for MSVC

src/Mod/Fem/App/AppFemPy.cpp

@@ -50,9 +50,6 @@
 #include <StdMeshers_LocalLength.hxx>
 #include <StdMeshers_NumberOfSegments.hxx>
 #include <StdMeshers_AutomaticLength.hxx>
-#if SMESH_VERSION_MAJOR < 7
-    #include <StdMeshers_TrianglePreference.hxx>
-#endif
 #include <StdMeshers_MEFISTO_2D.hxx>
 #include <StdMeshers_Deflection1D.hxx>
 #include <StdMeshers_MaxElementArea.hxx>