extract (and expand and clean up and document) the header window implementation used inside the generic wxDataViewCtrl in a separate wxHeaderCtrl class which could be reused in (generic) wxListCtrl and, most importantly, wxGrid later

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57093 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/missing.h

@@ -359,9 +359,13 @@ typedef struct _OSVERSIONINFOEX {
     #define NMHEADER HD_NOTIFY
 #endif
 
-#ifndef HDS_FULLDRAG
-    #define HDS_FULLDRAG 128
+#ifndef HDS_DRAGDROP
+    #define HDS_DRAGDROP 0x0040
 #endif
+#ifndef HDS_FULLDRAG
+    #define HDS_FULLDRAG 0x0080
+#endif
+
 
 #ifndef HDN_BEGINDRAG
     #define HDN_BEGINDRAG (HDN_FIRST - 11)