#397: Replace singletons with @functools.lru_cache() decorator

Moulrequested to merge
397_rm_singleton into main
  • Replace BlockchainParams() singleton with @functools.lru_cache()
  • Replace HeadBlock() singleton with @functools.lru_cache()
  • Replace UDValue() singleton with @functools.lru_cache()
  • Replace CurrencySymbol() singleton with @functools.lru_cache()
  • Replace ClientInstance() singleton with @functools.lru_cache()

Close #397 (closed).

Edited by Moul

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