Javadoc + warnings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23795 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Context menu appearance (checkboxes + paddings) (#2977)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23796 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e