AppleLAF

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26782 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Refactoring: too long method split

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26783 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
enable or disable the buttons redo, undo and save

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26784 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e