Performance test module started

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35187 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix problems with ClosestPoint[line, line]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35188 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
set grid-button selected, if grid is visible (styleBar, web)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35189 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e