Improve error handling#71

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marcovtwout wants to merge 3 commits intoCodeception:2.0from

marcovtwout:improve_error_handling

Commits on May 19, 2021

Fix notice when handling c3 error before C3_CODECOVERAGE_MEDIATE_STORAGE is defined
marcovtwout
committed
Attempt to write error log file even if it doesn't exist yet
marcovtwout
committed
Echo c3 error to screen and stop execution.
marcovtwout
committed