wl-pprint compatibility package

This package defines a compatibility layer between the old wl-pprint package, and the new prettyprinter package.

This allows easily transitioning dependent packages from the old to the new package, by simply replacing wl-pprint with prettyprinter-compat-wl-pprint in the .cabal file.

Note that this package is only for transitional purposes, and therefore deprecated and wholly undocumented. For new development, use the current version of prettyprinter.