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Prune locks

Placeholder Luke Dashjr requested to merge github/fork/luke-jr/prune_locks into master

This adds the ability to have any number of internal or external locks to prevent pruning specific block ranges.

Some examples where this would be useful:

  • Ensuring any known Core wallet won't become unable to sync due to pruning when it is unloaded. (Included in this PR)
  • Ensuring pruning doesn't go too far for a desired-functional wallet backup. (Questionable, since you probably lose the node if you need the backup anyway?)
  • Allowing users to temporarily disable block indexes and filters, without pruning cutting them off from catching up later.
  • Avoiding pruning out from under external wallets (Armory, EPS, etc) that might need block data.
  • External block indexes/filters, etc.

By design, users retain complete control over prune locks, and can delete them out from under applications using them. This is to avoid circumstances where a prune lock has been set, by an application that may no longer be used.

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