Fix caching issues which render remote ref caching ineffective #466
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Also set B019 as ignored.
The schema loader is asked to retrieve a validator per instance, in order to support the interface of metaschema evaluation. However, this results in a complete rebuild of the validator even when there is one schema being used for many instances (as in the `--schemafile` usage mode). Introducing an LRU cache on the validator builder results in the same validator being reused (and is sensitive to changes in settings/parameters). Additionally fix a bug in the remote ref download caching in which the key used for lookup was incorrect, rendering the cache completely ineffective. A new regression test confirms that the caching is fully effective by only observing the number of requests made by the program over "N" instancefiles, where N>=1.
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Fixes #463