weechatScripts.weechat-autosort: init at unstable-2018-01-11 (#51729)

Helpful weechat script to automatically keep buffers sorted.

Can be activated like this:

``` nix
weechat.override {
  configure = { ... }: {
    scripts = [
      weechatScripts.weechat-autosort
    ];
  };
}
```