Implement wx-prefixed macros versions of DECLARE/IMPLEMENT*CLASS macros.

Implement wx-prefixed macros versions of DECLARE/IMPLEMENT*CLASS macros.
Implement compatibility aliases for non-prefixed macro names.
Require a final semicolon where possible.
Correct a recurring error in the docs: IMPLEMENT/DECLARE_CLASS are alias to the DYNAMIC macros, not to the ABSTRACT macros.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64532 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775