VS: Add Windows Forms Support

Add support to maintain designer functionality for Visual Studio C++
Windows Forms projects.  Also add a test project showing how to use
the CMakeLists.txt file and, when successfully configured, will allow
use of the designer for the included form.

Source/cmVisualStudio10TargetGenerator.h

@@ -62,6 +62,7 @@ private:
   void WriteWinRTReferences();
   void WritePathAndIncrementalLinkOptions();
   void WriteItemDefinitionGroups();
+
   bool ComputeClOptions();
   bool ComputeClOptions(std::string const& configName);
   void WriteClOptions(std::string const& config,
@@ -91,7 +92,7 @@ private:
                          std::vector<cmSourceGroup>& );
   void AddMissingSourceGroups(std::set<cmSourceGroup*>& groupsUsed,
                               const std::vector<cmSourceGroup>& allGroups);
-
+  bool IsResxHeader(const std::string& headerFile);
 
 private:
   typedef cmVisualStudioGeneratorOptions Options;