This fixes two failing tests
* One was that when refactoring AestheticDirective, I accidentally
  broke doing padding before the value.
* The other was that when allowing for using multiple ` on a directive,
  I accidentally broke parsing for ` directives

This greatly increases the number of possible directives, though some of
them could be hard to name/remember.

The general rule of thumb is that the more '`' you have in a directive
name, the more arcane/specialized/rarely used a given directive is.

Fix using named parameters. Previously they just did not work

You can now use named prefix parameters in FORMAT strings.

Well, none of the directives support them yet, but they are accepted in
the directives, and it'll be easy enough to add the support