Stdout filters are now functions

This avoids the annoying toDelegate call everywhere.
If we actually need them to be delegates at some point,
we can change it back.

This also has the added benefit of not carrying any state with it,
which means we could parallelize it easily.
Facebook's analyzer is "flint", not "fflint"

It was being called "fflint" on my system due to a Makefile oddity.
Print scan-build output if verbose