Add C++ nested class example

This also reverts the nested class additions to the Java/C# 'class' example
so that the 'class' example remains identical across different language modules

Examples/csharp/nested/Makefile

@@ -0,0 +1,19 @@
+TOP        = ../..
+SWIG       = $(TOP)/../preinst-swig
+CXXSRCS    = example.cxx
+TARGET     = example
+INTERFACE  = example.i
+SWIGOPT    =
+CSHARPSRCS = *.cs
+CSHARPFLAGS= -nologo -out:runme.exe
+
+check: build
+	$(MAKE) -f $(TOP)/Makefile csharp_run
+
+build:
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' csharp_cpp
+	$(MAKE) -f $(TOP)/Makefile CSHARPSRCS='$(CSHARPSRCS)' CSHARPFLAGS='$(CSHARPFLAGS)' csharp_compile
+
+clean:
+	$(MAKE) -f $(TOP)/Makefile csharp_clean