Replace lru with schnellru

[nazar-pc]

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Motivation

Version of lru used right now is old (0.8 instead of current 0.10), also schnellru was introduced as supposedly faster and more featureful replacement.

Request

Replace all usages of lru with schnellru to de-duplicate dependencies

Solution

No response

Are you willing to help with this request?

Maybe (please elaborate above)

[bkchr]

@koute WDYT?

[koute]

Yeah, sounds good to me. schnellru should be pretty much a drop-in replacement for lru from a practical point of view.

For performance it probably won't make a difference since I don't think lru is used in any significant hot loops, but it's always nice to get rid of some extra dependencies.