Ticket #4080: substituting most of Unicode sequences into Unicode characters (but this is not perfect yet)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31792 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
* correct cut to left
* correct remove/add to points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31793 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4080 more tests added

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31794 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e