1-series overhaul

[Ambrevar]

This is a pretty big overhaul of the library. Except from the README:

- Renamed =scheme-name= to =keyscheme= and =scheme= to =keyscheme-map=.
  It's more consistent and intuitive.  The previous naming was really confusing.
- All warnings have now their own conditions, see the =nkeymaps/conditions= package.
- =define-keyscheme-map= has a different syntax, it's now
  #+begin_src lisp
    (define-keyscheme-map "NAME-PREFIX" (:import OPTIONAL-KEYSCHEME-MAP-TO-IMPORT)
      KEYSCHEME BINDINGS...)
  #+end_src
- The predefined =keyscheme=s are now accessible from the =nkeymaps= package.
- New =default= =keyscheme= which is the new parent of other keyschemes
  (including =cua=), instead of =cua=.
- =*modifier-list*= is no longer exported.  Instead, both =keyscheme= and
  =keymap= have a =modifiers= slot for the modifiers they accept.
- Switched testing framework from =Prove= to =Lisp-Unit2=.
- Removed the =cl-str= dependency.

@jmercouris @aadcg @aartaka What do you think?
I'll also open a pull request for Nyxt to prepare for the 1.0.0 update.

[Ambrevar]

Note: Looking at individual commits will help here :)

[aadcg]

That's a big overhaul! Thanks.

Shouldn't the version be 1.0.0, instead of 1 in the .asd file? I'm also wondering why did you decide to move from prove to lisp-unit2.

I fixed a minor typo and pushed here.

Will we use the same git merge strategy we use in Nyxt?

Once this is merged, I'll update the guix package.

[Ambrevar]

1. It's "1" because it's incompatible with the previous tagged release but it's not 1.0.0 ready yet. I'll update that ASD version and tag the commit all at once, when we confirm this is ready.

2. For the rationale behind the move to Lisp-Unit2, see Move from Prove to Lisp-Unit2 nyxt#2199 (comment).

3. Yes, we can use the same git branching management as with Nyxt.

4. Thanks!

[aadcg]

All clear.

[aartaka]

1. It's "1" because it's incompatible with the previous tagged release but it's not 1.0.0 ready yet. I'll update that ASD version and tag the commit all at once, when we confirm this is ready.

For that, a more conventional (at least based on my limited experience of lurking around moder git repos) tag would be 1-beta1 or 1-pre-release-1 (as in Nyxt).

[Ambrevar]

ASD only supports numbers.

[aadcg]

I commited dd35d31 to fix ecd1557.

[Ambrevar]

Merged with 23c6801.

1.0.0 is out! :)