[BIP-3] An update for governance rules

This proposal seeks to: expand governance rules and weights for voting, from (1) BOR tokens to (2) BOR tokens + other BOR related/staked tokens.

Details are below: The new governance: voting weight=BOR token balance x 50%+ (Total pledged BOR quantity in tunnel +Tunnel unlocked BOR quantity +Tunnel locked BOR quantity +Uniswap BOR-ETH pair LP token quantity +Sushi BOR-ETH pair SLP token quantity) x 100%.

For example, if you pledged 10 BOR in oBTC Tunnel and added 5 BOR in Sushiswap BOR-ETH Pair. At this moment，you have 15 Boring voting weight.

The current governance voting system only allows a small percentage of BOR holders/community to participate.

This introduces some potential issues:

(1) More centralised voting - which could lead to poorer decision making and community discourse. We want to provide a better ownership to BOR holders and allow all BOR voices to be heard.

(2) the previous governance unfairly excludes BOR holders who pledge, stake in tunnel or Sushiswap SLP pool and contribute to BOR in other ways. We want to correct this.