styling of submenu for toolbar

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32600 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
AlgoStemPlot has MathQuillGGB-compatible LaTeX syntax now, so it works in Web

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32601 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
I added the small triangle again, every tool has the triangle now.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32603 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e