Contest

* Add resource capability to copy files into test directories

* Fix bug on some platforms due to gratuitous `f-string` prefix.
* Add Python 3.8 to testing

* Support only Python 3.6, 3.7, 3.8
* Automatically adjust paths for executable and input paths
* Add ability to configure env
* Add ability to fail on first error
* Add ability to configure streams:
* compare maximum number of lines
* offset for which line to start at
* check if a stream is explicitly empty or nonempty

Fix versioning issue

Fix bug where test names are not output correctly

Fix broken import exception