Randomness control, filesystem control and better logging

### Test API - Prepared values log their actual values to the test output (#17, !19) - Improved logging for finalizers (!19) - Document the usefulness of PreparedProvider (#19, !20) - Generate random values, and reproduce previous test executions by generating the same random values (#24, !26) - Made the name of prepared values public (63f52eb1, !23) ### Runners - The Kotest runner now exposes the Kotest engine (#15, !17) ### Compatibility modules - Utilities to create temporary directories and files with java.io and java.nio (#21, !23) ### Build and deployment - Switch from Dokka to Dokkatoo