Add wxDEPRECATED_MSG() and use it in a couple of places.

Add wxDEPRECATED_MSG() and use it in a couple of places.

This macro should be used instead of wxDEPRECATED() for the new deprecations
as it allows to give a helpful explanatory message (if supported by the
compiler) and also is simpler to use as it doesn't require wrapping the entire
declaration in it but can be simply used before it.

Also add wxDEPRECATED() support for clang as a side effect.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74754 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775