Fully remove the `Parsing.Pos` module?

[JordanMartinez]

Since the Parsing.Pos module is being deprecated and all of its members are already being re-exported by the Parsing module, can we just remove it entirely? The Text.Parsing.... module rename change is already a breaking change that forces users to update their imports. We may as well make this breaking change so there's one less breaking change in the 0.16.0 round of changes.

Thoughts?

[jamesdbrock]

I agree, I'll do that.