We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.
- Materialize unit when its value is actually needed.
- Special-case Unit_getInstance return type at codegen. It should be a
proper Unit object instead of a "void"
Added creation and initialization of the test module and its dependencies.
When looking at the emptyProgression test,
I found that getProgressionLastElement was not found,
which should be resolved from the dependencies.
Ivan Kylchik