lens-family-simple

This just re-exports the combinators and elementary 'van Laarhoven' lenses from Russell O'Connor's sublime lens-family-core package, including "Lens.Family.State.Strict", and the corresponding TH module from lens-family-th.

lens-family has a complex structure and distinctly unpleasant module names, so I made this for my own use, but maybe with experience it will prove to be a sensible idea -- or not. It is mostly just intended to simplify imports for use with pipes and associated pipes libraries. The special quasi-lenses that pervade these libraries frequently require, at a minimum, that some version of view/(^.) and zoom should be in scope. (The effect of import Lens.Simple is at the moment a bit like that of import Control.Lens; presumably much more should be hidden!)

The only non-ghc-boot library lens-family-core and lens-family-core require is mtl.

The naming in lens-family is more or less uniform with the more powerful and elaborate lens library, so it can be dropped in favor of lens should this become necessary.

---

The pong example from lens/examples is included here as an illustration of the strenth of lens-families + lens-families-th. Nothing is needed but the change of imports.