#3775 common interface added. Hope didn't broke anyting :-)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29895 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3775 ooops .-)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29896 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix for META-INF/services/javax.xml.parsers.DocumentBuilderFactory problem

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29897 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e