Properly Colored Unicode Graphs

[raxyte]

Is your feature request related to a problem? Please describe.
Currently, Neogit does not have the ability to show colored unicode graphs (much cleaner), unlike the ASCII version. This results in an unfortunate look for them.

Describe the solution you'd like
Similar coloring to the ASCII graphs would be fantastic.

Describe alternatives you've considered
Switch back to the ASCII version. (I much prefer to not go back.)

Additional context
Since it looks like this was initially inspired by vim-flog, perhaps looking at it is of help?