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

interface/wx/msw/registry.h

@@ -355,6 +355,18 @@ public:
     */
     bool QueryValue(const wxString& szValue, wxMemoryBuffer& buf) const;
 
+    /**
+        Retrieves a multiple string value.
+
+        The @a szValue must exist and have @c REG_MULTI_SZ type. The names and
+        the values of the pairs present in it are returned in the @a names and
+        @a value arrays, which will have the same (possible 0) size.
+
+        @since 3.1.0
+     */
+    bool QueryValue(const wxString& szValue,
+                    wxArrayString& names,
+                    wxArrayString& values) const;
     /**
         Renames the key. Returns @true if successful.
     */