Always create system address after block execution

[debjit-bw]

• adds conditional logic for system address to maintain consistency with nethermind in both genesis hash and state root
  • adds system address as new account if it's loaded without existing (converted to touched + created)
  • removes system address from state transitions from block 2 onwards to prevent it being wiped in accordance to EIP-158/161

[dapplion]

Thank you for the clarifications! But please commit them in the code as comments. Imagine these comments to be high quality documentation for technical readers that have a basic understatement of the system but not detail knowledge like you and I.