Allow to use shorter module basename in direct link to open module, which are added by extensions

It is possible to use shorter link to open built-in modules. F.e.: we can access "List warnings" via mcp.php?i=mcp_warn&mode=list or mcp.php?i=warn&mode=list

But extension link to module is too long f.e. mcp?i=phpbb_ext_author_extension_mcp_extensionmcp
It should be also possible to use shorter link such as f.e. mcp?i=mcp_extensionmcp