Very first try to implement TLatex processing in JSROOT
Very first try to implement TLatex processing in JSROOT

Before simple symbol replacement was used.
Now we will try to separate different parts and process them with tspan.
It will not be perfect, but will provide basic features like color or
italic or better handling of superscript
bellenot/jsroot,linev/jsroot,linev/jsroot,bellenot/jsroot,root-project/jsroot,root-project/jsroot,bellenot/jsroot