synth checks; churn height; stats speedup; refund indexing; legacy stats removal; housekeepings

Muninn Ravenrequested to merge
feature-muninn2 into develop
  • synths in statecheck
  • test refactorings
  • fix next churn height calculation
  • fix dropped refunds because of nonutf8 events
  • remove v2/pool/POOL/stats/legacy
  • speed up swap calculation in v2/stats (60s->2s)

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