Reynir-correct

* Added support for Flesch-Kincaid readability score
* Added support for rare word detection
* Added support for E006: Abbreviations should be written in full. (can be disabled by ignore_rules)
* Added support for E007: Exclamation marks are inappropriate. (can be disabled by ignore_rules)
* Redesigned the API to be more user friendly
* Some minor bug fixes

**Full Changelog**: https://github.com/mideind/GreynirCorrect/compare/3.4.7...4.0.0

* Added support for handling custom tone-of-voice issues through an optional configuration file
* Added support for loading an optional module with additional patterns, from the custom config
* Default GreynirCorrect.conf now loaded into a Settings object that may be updated by the custom config
* New error codes added for tone-of-voice issues, V001 (simple rules defined in the custom config) and V002 (patterns loaded as a Python module through a file path in the custom configuration file)
* Allowing consecutive numbers, for phone numbers, etc.

* Minor addition to unique errors
* Explicitly noting support for Python 3.10, 3.11 in setup.py

- Taboo data updated
- Error code documentation updated
- Guidelines made more detailed
- Various error handling updated
- Neural sentence classifier added to grammar checking CLI

- Latest version of _Ritmyndir_ added
- '_í takti við_' removed as an error, no basis in The Standards can be found
- Capitalized words are no longer marked as errors unless the suggested value is also capitalized
- Certain common words are now excluded from the taboo vocabulary, such as '_nýbúinn_' (very common with another meaning) and '_hommi_' (should not be marked as a taboo word)
- Capitalized adjectives are still marked as an error, but only with the option `suppress_suggestions` set to `False`. These are in many cases a part of named entities (_Danska ríkisútvarpið_, _Íslensk erfðagreining_), but are also common as errors.
- Spans for '_af/að_' errors limited to the word that is changed. The same goes for the suggest value.

* Added back older command-line options for backwards compatibility