Added visibility matchers to check that a class isPublic(), etc. #291
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Covers all 4 visibilities, and all reflective elements (classes, methods, fields, etc.) with reasonable messages when used incorrectly.
These matchers are helpful, for example, when enforcing the scope of a public-facing API with a test,
which provides stronger documentation for the future than mere comments.
I've performed similar checks in the past in projects with many, many artifacts to make sure that certain methods are definitely visible outside of a library, for consumption by another library or for invocation by reflective techniques.