Updates to Lessons, Reviews, and Extra Study

@tofugu-scott I use the Lesson Filter script for both of those purposes.

I also use it to reduce my lesson batch size to 1 item per day whenever I feel overwhelmed. This allows me to keep my WaniKani habit alive and continue making slow but steady progress when life happens. (Native WaniKani does not permit lesson batch sizes smaller than 3.)

It definitely helps me stay on track when I feel like quitting

Heatmap Stories! (WaniKani Activity Chart) - #337 by nemurineko