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
XRC: make wxStaticText's wrap property a dimension.

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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74864 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Misc XRC format docs corrections.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74865 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775