Avoid comma-separated use statements to require MOODLE_INTERNAL #176
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No matter that comma-separated use statements are a violation of
the coding style (see Namespaces section), they, for sure, don't
constitute a side-effect at all, so the MOODLE_INTERNAL check
should be immune to them.
This fix just enables comma-separated to be properly processed,
covered with tests.
Fixes #175