Legacy scores + cleanup + class/curPercent stats + age + recommendedHHFs

Shit's snowballing yo, if you wanna shame me for it -- you better start contributing to hold me accountable and now cowboy shit up =)

Fix number of scores showing all scores, including legacy. Now this is split into HF scores (Scores) and Legacy Scores.
Add Incl. Legacy checkmark in classifier runs, to see all scores for the classifier
remove some old unused fields in the classifiers.api.js output, that isn't being used by frontend
classifications page: add switch between byClass/byCurPercent
add age to shooters table
use that age to calculate fresh shooters in the division, to use as target for recommended HHFs
add recommended HHFs to historical HHFs table and ScoresChart

CodeHowlerMonkey / hitfactor.info