Add testing for translation tool.

Add tests for the translation of Concepts to STGs.

Tests to be added:

[x] Test that a correct .g file is generated with a simple example, featuring 3 signals, each of a different type.
[x] Test the list of arcs produced by a handshake concept description.
[x] Test the list of arcs produced by an OR-gate concept description.
[x] Test the list of arcs produced by two AND-gates composed in a concept description.
[x] Test that two different concepts descriptions for the same specification are equal. e.g. A C-element described two different ways.

tuura / plato