[TGE] PoW Layer preparation for TGE

[ahtotruu]

• No transactions
• Reference to the old chain (e.g. final hash)
• Public Keys of the BFT validators
• Minting new token emission
• (consolidating old tokens by owner?)
• Vesting
• Hashrate adjustments - less sensitivity to fluctuations
• Inflation (5% annually, then -> 2%, details TBD)
• Block time (e.g. 20 min)