vote_periods enhancement

[Nadro-J]

Implement minimum participation per track

{
  "Root": {
    "decision_period": 28,
    "internal_vote_period": 7,
    "revote_period": 20,
    "min_participation": 50%
  },
  "WhitelistedCaller": {
    "decision_period": 28,
    "internal_vote_period": 2,
    "revote_period": 20,
    "min_participation": 50%
  },
  "StakingAdmin": {
    "decision_period": 28,
    "internal_vote_period": 7,
    "revote_period": 20,
    "min_participation": 50%
  },
  "Treasurer": {
    "decision_period": 28,
    "internal_vote_period": 7,
    "revote_period": 20,
    "min_participation": 15%
  }
}