Added support for OpenGL 3.0 Replaced WindowSettings with ContextSettings Synchronized with trunk git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1065 4e206d99-4929-0410-ac5d-dfc041789085
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1023 4e206d99-4929-0410-ac5d-dfc041789085
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/trunk@1002 4e206d99-4929-0410-ac5d-dfc041789085