XRC: make wxSplitterWindow's sashpos and minpanesize dimensions.

Parse them as dimension type (including dlg units) and not just integers. This is backward compatible.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74863 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/xrc_format.h

@@ -1666,9 +1666,9 @@ wxWidgets 2.9.5, another one:
 @hdr3col{property, type, description}
 @row3col{orientation, @ref overview_xrcformat_type_string,
     Orientation of the splitter, either "vertical" or "horizontal" (default: horizontal).}
-@row3col{sashpos, integer,
+@row3col{sashpos, @ref overview_xrcformat_type_dimension,
     Initial position of the sash (default: 0).}
-@row3col{minsize, integer,
+@row3col{minsize, @ref overview_xrcformat_type_dimension,
     Minimum child size (default: not set).}
 @row3col{gravity, @ref overview_xrcformat_type_float,
     Sash gravity, see wxSplitterWindow::SetSashGravity() (default: not set).}