Improve File-Checking

[s2t2]

Currently, the file-checker is able to identify presence or absence of a directory named "test" or "tests", but students sometimes put their tests in the root repo and in smaller apps this is fine. So instead of checking for specific file names, this script should check if any files exist in the repo which have either "test" or "test" in their name.

The same multi-file checking process can be applied to other checks as well. For example, if there is a "README" or "README.md" or "README.txt" the script should classify that repo as having a README. And if there is a "LICENSE" or "LICENSE.md" or "LICENSE.txt" the script should classify that repo as having a LICENSE.