SmartCache extended version of the caching system with protection against the effect of "dog pile" and other "goodies"

The module solves the main "childhood diseases" of the opencart caching system:

1) "Dog pile" (anti-slam, dogpile effect). When multiple processes try to create the same cache file at the same time. Because of this, the load on the server can increase dramatically
2) Cache invalidation. By default, the standard cache invalidation for each request (and at the same time massively for the entire cache), which when using glob and a large number of files puts a significant load on the server. In this module, the invalidation goes in the background and only of the cache that is in demand.
3) Own cache lifetime for different cache groups (prefixes).
4) Randomizing the lifetime of the cache allows you to avoid its simultaneous disability/generation

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