#10 missing math symbols to replace

[Ildar Mulyukov]

the data for replacing characters to replace by Math is quite incomplete. I see a big file source/java/writer2latex/latex/i18n/symbols.xml containing the info. I guess it is autogenerated.
Is it possible to update it?
namely these chars aren't converted: 〈〉—
I found a site that converts the above symbols: https://www.johndcook.com/unicode_latex.html

P.S. I converted the SVN into GIT, may be useful: https://github.com/ildar/writer2latex