forked from GitHub/gf-core
GF.Data.Utilities: Rename mapFst to apFst, mapSnd to apSnd. Add apBoth, mapFst, mapSnd, mapBoth. GF.Data.Operations: Remove onSnd (same as apSnd)
GF.Data.Utilities: Rename mapFst to apFst, mapSnd to apSnd. Add apBoth, mapFst, mapSnd, mapBoth. GF.Data.Operations: Remove onSnd (same as apSnd)