Made ckeditor5-dev-tests a general use application

[fredck]

Suggested merge commit message (convention)

Feature: Made ckeditor5-dev-tests a general use application. Closes ckeditor/ckeditor5#7196.

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Additional information

This implementation is pretty simple, doing mainly the following:

• Allow --files to point to resolved globs, by beginning the with ./.
• Introduced --coverage-paths to point to additional paths to be included in coverage.

It basically doesn't change the current features, just adding to top of them.

I've been able to successfully use this with arguments like --files=./tests/unit/**/*.js --coverage-paths=./src.

This should even allow to enable tests when cloning a single editor plugin, instead of having to deal with the big and fancy ckeditor5 repo.

[coveralls]

Coverage increased (+0.03%) to 87.174% when pulling 1ad3ab9 on t/593 into fb13c95 on master.

[pomek]

See: ckeditor/ckeditor5#7196 (comment).

[fredck]

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