Write Japanese: Kanji and Kana

Aug 17, 2018

Add a 'Character Cooldown' feature, so characters aren't repeated too often. This is customizable by users in 'Progression Settings'.
Add setting to skip SRS for characters after drawing them correctly on the first attempt.
Remove randomness from character progression. Improves testability and repeatability. Randomness still present if Shuffle mode is enabled.
Fix bug where completion metrics in 'Study Progress' and 'Study Goals' could differ slightly.
Additional bug fixes (see release notes).