Rewrite printing for better terminal support and looks about hired

[sidju]

The plan is to write some custom printing logic that handles the length calculations and wraps nicely where needed.
While at it we add printing of separation characters after the line numbering and as a horizontal line before the new command line.

[sidju]

The highlighting is to be revamped in the same vein, using a basic regex engine based on config files mostly following Sublime's format.
Theming will be done through the main application config by giving any string to start and another to end the highlighting of each type. This results in theoretically complete terminal support.

[sidju]

Using the same hack as 'bat' a working solution now exists.