* I HATE DYNLANGS!

* Reduces the amount of complex objects being referenced from
  Mutant::Config
* Prepares to read the config from other sources than the CLI, (AKA
  config file)
* Opens the door for configuring more details, Mutant::Config is
  supposed to be the source of "primitive truth", where Mutant::Env is
  the compiled version that applied the config to the env.
* Fix adjacent mutations in Mutant::Env namespace

* Passing the expression parser directly reduces the amount of state
  integrations needlessly have access to.

* New primary interface #call makes specs and implementations much
  easier
* We had #each mostly for historical reasons that are not relevant
  anymore
* Mutation covers the Mutant::Matcher namespace

* A relict from the days where test selection depended on this
  information
* Kill mutations in Mutation#insert, also very old code.