Resume ballot on top of overlay v2 - #5417
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This change allows stellar-core to quickly resume balloting when a transaction set arrives, rather than waiting for a ballot timeout to resume. It creates a registry of stalled slots, and checks tx sets that arrive to see if they could potentially unstick those slots. A stall can only be resolved by a tx set if the ballot protocol has not undergone any changes since hitting the stall point. This prevents prevents us from resuming with a ballot when the node may have moved on to a different value. This change also adds `c` to the calculation of ballot ordering. This is necessary because without it, a node that exercises this quick-resume path has no way of informing the network as they will discard a ballot where the other variables are unchanged.
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