Add Fearow's moves.

Nothing else is missing — or, at least, nothing else is missing from
veekun's DB after I import learnsets.
Fix Floette's level-up moves.

I don't have an Eternal Floette to test on; I just assumed the same
changes would be necessary, since the only difference is supposed to
be Light of Ruin.
export-json.js: deal with event moves.