Refactor backend cache#58
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This commit restructures the current cache to allow the backend to customize the included module, simplifying greatly the code.
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The current code is unnecessarily complicated. This PR simplifies things so that backends can include a custom module through an
apply_modulehook. This allows KeyValue and Table backends to modify the Cache module they use just slightly to achieve the same result.A module builder called
TranslationCacheris shared by all cacheing strategies to cache reads; the only difference is which method is cached: in the default Cache module,readis cached; in KeyValue and Table backends,translation_foris cached (so that the translation record itself is cached, rather than the translation value).