Tree style navigation with file icons

[torncheesecake]

Much like Atom I would like to see a tree style sidebar with file icons, instead of the per folder side bar that is currently in place. Having sub folders means I lose my list of modules and names and makes looking up other files a pain having to switch back and forth through folder sidebars instead of just dropping down a folder list.

[iRyusa]

I think we can commit to a simple file tree lib in react/electron, I don't think this would be hard to do and it could be a good beginner issue for anyone.