Use HashMap rather than Properties for utf => TeX conversion

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26472 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure GeoGebraExport does not need IOException

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26473 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3337: bug fixed with more than 2 views (length)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26474 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e