Fix inclusion of fortuno in cmake, following update of upstream HEAD.

This MR:

• Fixes inclusion of fortuno in cmake
• Propagates API changes to existing tests
• Introduces test driver file as an intermediate layer, else fortuno_app would explicitly list tests for every Octopus module under test
• Add test driver boilerplate, so new developers only need to a) add their module test and b) add that to the subfolder driver
• Updated the documentation