Reconcile parser APIs accepting folds/parsers

[harendra-kumar]

For example we have a takeWhile and takeWhileP. Should we keep both or just rename takeWhileP as takeWhile because it is more powerful and covers the other case as well.

[harendra-kumar]

There are other such parsers if we plan to keep both versions than we need to follow the naming convention so that we rename the Parser accepting ones with a P suffix, specifically takeEndBy parser.