Add react-virtualized

[shapkarin]

Not sure but maybe it's a good idea to add react-virtualized or react-window. The last look better for that project.

[shapkarin]

Not sure when I can do that, but maybe I try with https://github.com/Lodin/react-vtree

[shapkarin]

Start to playing around with that at optimization branch
Maybe I will try react-vtree instead of react-virtualized-tree to reduce the bundle size.

That change can brings really great optimization but it will totally brings a lot of different refactoring.

P.S. also I was playing with that solution but it looks wrong because it makes window that same with tab.

[shapkarin]

I'll try to deal with that at this week. Also feel free to add "help wanted" status, if you agree that this optimization is necessary.