minor perf. updates to Fold
remove Hylo
remove Stream
add Fusion/Transforms
add concatMap tests
some concatMap stuff
foldCmap: fuses with build
remove foldCmap; performance not so good
add TerminateEarlyStateful exception
add a bunch of delimitFold variants
add delimitFold benchmarks
IterX.Parser: fix bug in drop
IterX.Parser: add splitChunkAt
Fusion: add more transforms
Fusion: more folds
add mealyM,transduceFold
WIP: perf. adjustments (from sndfile)
replace monad-control with exceptions
bump deps
remove some unhelpful RULES