Add support for reading multi string values to wxRegKey.

Add a wxRegKey::QueryValue() overload working with REG_MULTI_SZ values.

Closes #16653.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78136 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/registry.h

@@ -205,6 +205,10 @@ public:
   bool  SetValue(const wxString& szValue, const wxMemoryBuffer& buf);
     // return the binary value
   bool  QueryValue(const wxString& szValue, wxMemoryBuffer& buf) const;
+    // return multiple strings
+  bool  QueryValue(const wxString& szValue,
+                   wxArrayString& names,
+                   wxArrayString& values) const;
 
   // query existence of a key/value
     // return true if value exists