Warning and review notes fixes.

WITH_WINRT -> ENABLE_WINRT_MODE;
Some temporary char* replaced with Ptr<char>;
Build fix for regular WIN32;
Windows Platform SDK and MSVC search added to cmake;
Warinig fixes.

modules/ts/include/opencv2/ts/ts.hpp

@@ -10,6 +10,10 @@
 
 #include <stdarg.h> // for va_list
 
+#ifdef HAVE_WINRT
+    #pragma warning(disable:4447) // Disable warning 'main' signature found without threading model
+#endif
+
 #ifdef _MSC_VER
 #pragma warning( disable: 4127 )
 #endif