Refactoring: push logic out of LAF class

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34864 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Multiargument if support

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34865 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e