Sts-lib

* Added support of `auto_space` config.
* Added support of new IDC in Unicode 15.1.

* A dict entry whose value is an empty array is now never matched.
* Text excluded by a regex is now specially wrapped as a one-element array.
* Support dismissing a word and re-convert as a shorter word.

* `�r��` (without `\t`) in a plain text dictionary is now treated as `�r��\t�r��`.

* Removed `remove_keys` and `remove_values` modes, and merged them into `filter` mode.

* Fixed possible index error for `expand` mode.
* Support expanding one key to multiple values for `expand` mode.

* Added support of config using `.yaml` or `.yml` extension.
* Reworked the scheme of `config["dicts"]` to allow providing recursive dict scheme.
* `include` and `exclude` properties in a dict scheme now only works with mode `filter`.
* Added new modes `expand`, `remove_keys`, and `remove_values` for dict scheme.
* Added static web site builder.