Hide AnimatedGifExport behind interface

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27992 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Do not instantiate infobar in Desktop directly

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27993 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Null pointer check

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27994 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
More GUI / AppD separation

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27995 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e