Add Microsoft Visual Studio 2017 solution file for building wxMSW

Allow building with VS15 out of the box.

Closes https://github.com/wxWidgets/wxWidgets/pull/353

include/msvc/wx/setup.h

@@ -65,6 +65,8 @@
         #define wxCOMPILER_PREFIX vc120
     #elif _MSC_VER == 1900
         #define wxCOMPILER_PREFIX vc140
+    #elif _MSC_VER >= 1910 && _MSC_VER < 2000
+        #define wxCOMPILER_PREFIX vc141
     #else
         #error "Unknown MSVC compiler version, please report to wx-dev."
     #endif

include/wx/msw/seh.h

@@ -57,7 +57,7 @@
     // up to VC 12 this warning ("calling _set_se_translator() requires /EHa")
     // is harmless and it's easier to suppress it than deal with it as make/
     // project file level as it seems to be harmless
-    #if __VISUALC__ < 1900
+    #if __VISUALC__ < 2000
         #pragma warning(disable: 4535)
     #endif