(feat) Add project creation helper

This code is taken from Cargo project, simplified and adapted to iron-test needs.
Again, cargo artefacts. In our case the root is in target/iron-integration-tests/test-GUID/project_name, so no Git here. In cargo the test cases are more complex, so they deal with git DB as well. I'll clean this up a bit later today, not with my laptop now. Thanks for spotting this :)