Made overloads public

Support for AOT/trimming deployment scenarios.

Fixed a critical bug in Try()

ManyThen et al

Added Enum and CIEnum

Write your own parsers and TokenStreams

strong naming, snupkg, internal improvements

CurrentOffset, Rec overload, Slice, and a bugfix in Real

C# 8 nullability checks; removed netstandard1.3 support; various bug …

…fixes

MapWithInput, Real, and performance improvements