[Haskell] GHCi plugin

As stated, it’s a basic plug-in for GHCi sessions. Single Haskell source file, 175 lines; no dependencies other than base.

The repo page is https://github.com/CubOfJudahsLion/tm-ghci.
The first [pre]release binaries can be obtained at https://github.com/CubOfJudahsLion/tm-ghci/releases/tag/v0.1.0-alpha.

[Thanks go to mgubi for setting me straight on proper help-file organization for plugins.]