Introduce ants_impl behaviour
Actually implement the ants_impl behaviour and use it
Merge get_move and apply_move into one call from parallant_seq
Extract langton's ant model to a new module
Move cell state inside ant record, delete world_impl modules
Move population creation to the model
Implement applying moves in the model_langton and clean ants_impl and model behaviours.

Also copy model_langton to model_forams in order to prepare for the implementation.
Introduce algae in model_forams
Allow creating and deleting agents from modelling modules
Display current env state with model defined representation

Cleanup graphics and logger modules
Update test script
Remove unused code, obsolete functions and records; skip tests on tiled algorithm
Handle getting and updating agents yet nonexistent
model:move/3 should take position() as a first parameter
Remove unused skel dependency
Update running and configuration description
Fix style issues
Fix and clean types
Merge pull request #10 from ParaPhraseAGH/forams_prep

Redefine interface of the platform, prepare for implementing foraminifera