c3
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Improve error handling
Improve error handling in a number of ways (see commit messages).
If not all parts of this PR are desirable in general, feel free to cherry pick.
Also fixes https://github.com/Codeception/c3/issues/41 and https://github.com/Codeception/c3/issues/37
@Naktibalda Would this PR be acceptable for a new major version of c3?