* fixed Bulgarian layout: moved 'ь' to 8-key
* added a migration for removing all Bulgarian words, since the digit sequences are no longer compatible with the new layout
* fixed incorrect text case of some words
* removed some nonsense words
* added new Bulgarian words
* the dictionary loader now supports word frequencies
* word frequency validation upon building
* added default word frequencies to all dictionaries
* updated documentation
* fixed some English words always appearing in small letters, when some should be capitalized (I, Friday, December, etc...)"
* fixed Bulgarian words that should have been capitalized, but were not
* fixed mixed case suggestions priority not updating
* optimized dictionary loading (it's more than 2x faster now)
* fixed the last words of dictionaries not being loaded
* Settings screen is now based on the Android SharedPreferences
* Added function key configuration on the Settings screen
* Added a setting for toggling the on-screen buttons
* Added a dark/light theme setting
* Improved translations
* Fixed a problem with launching the Settings screen directly from the Android settings
* Fixed ignoring keys not actually ignoring them properly
