Implement retry mechanism while fetching resources #414
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Fixes #390
Built-in fetch helpers can be used to initialize the adblocker from pre-built presets or raw lists (fetched from multiple sources). In case of failure (e.g. timeout), the whole process of initialization fails. Timeouts are not so uncommon, and retrying to fetch usually succeeds. This PR implements a simple retry-mechanism to make it much more unlikely for initialization of the adblocker to fail.