Ticket #3957: adding more functions that need to be treated as functions in MathQuill (the list might still not be comprehensive)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31258 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4004: enhancing r31258 that must have been assigned to this ticket instead of #3957

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31259 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e