Greg Hysen 6617ad9531 Refactored finalization state.
1. Removes state variables:
   - totalWeightedStakeThisEpoch
   - totalFeesCollectedThisEpoch
   - numActivePoolsThisEpoch

2. No longer indexes by epoch % 2

3. Renamed event StakingPoolActivated → StakingPoolEarnedRewards.

4. Renamed structs:
   - ActivePool → PoolStats. This holds stats for a pool that earned rewards.
   - UnfinalizedState → AggregatedStats. This aggregates stats from the former struct.
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