Support for powerline

[AGhost-7]

I love the idea behind this project. Its such a pain normally to make everything in your terminal match a single theme.

While Powerline isn't usable from Neovim, I still use it for TMUX and shell rendering. I was thinking it could be extended to generate code for powerline configurations, and maybe even others.

If this is out of scope I'm thinking instead a plugin system could be created, and then you can add more template types.