Remove usages of Commons Lang 3

[basil]

As a prerequisite to #550, remove usages of Commons Lang 3 from this repository. Although Commons Lang 3 was part of a public API, in practice no consumers existed other than a class in a different package in this repository itself (thankfully). In any case, the use of a tuple in the return type was unnecessary — the Server object has a reference to the ServletContext which can be fished out by any consumers that need it.

Testing done

Ran Text Finder plugin tests with this PR.

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[Vlatombe]

LGTM