shifts encounter data from Legal's split tables to individual files for
easier maintenance and initialization. Legal Core's init is so much
simpler now.
fix resource name typo
gen5 N pkm already checked, don't flag SID
mystery gift non-eggs already checked, don't flag SID
add used DNA splicers to b2w2 permitted key item list
fix b2w2 new-altform movesets; kyurem is tricky where the form does not
exist in bw's moveset, so both indexes have to be used.
Closes#1211 , thanks @sora10pls !
