more /Wp64 warning fixes: mostly use UINT_PTR instead of UINT and define our WX[WL]PARAM with __w64 if available to avoid hundreds of warnings when casting LPARAMs to pointers/handles

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52165 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -1033,7 +1033,7 @@ bool wxLaunchDefaultBrowser(const wxString& urlOrig, int flags)
 
     ::ShellExecuteEx(&sei);
 
-    const int nResult = (int) sei.hInstApp;
+    const INT_PTR nResult = (INT_PTR)sei.hInstApp;
 
     // Firefox returns file not found for some reason, so make an exception
     // for it