DI: Enable DI-based creators.

* Add a mechanism to analyze the Guice dependency graph to
  collect the set of genotypes that is required to obtain a
  requested Phenotype. The code is a modified version of
  the dependency graphs calculated within Guice's Grapher
  extension). The list of required Genotypes determines
  the list of creators to be launched.
* Use OperatorModules from Opt4J to inject them into the fw
  instead of using custom ones (conflicting inheritance
  hierarchy).
* Register Variables at the service level (Genotypes,
  Creators, Operators).

Signed-off-by: Alexander Diewald <diewald@fortiss.org>