Rename settings.php page

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1026412 b8457f37-d9ea-0310-8a92-e5e31aec5664
Drop old  handling file for Settings page

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1026413 b8457f37-d9ea-0310-8a92-e5e31aec5664