[Feature] WIP improvements

[cyraxred]

Feature Description

Notes on https://github.com/windranger-io/windranger-mass-delegation-contracts/blob/jo-delegate2/contracts/MerkleDelegation.sol

• use verifyCalldata instead of verify - there will be a considerable gas difference for longer proofs
• governance token can be hash at the root, not at leafs (https://github.com/windranger-io/windranger-mass-delegation-contracts/blob/jo-delegate2/contracts/MerkleDelegation.sol#L91) - it will speed up building of a large trie a bit
• you dont need checkpoints actually, because you can call a contract with a blockTag. Also using blockTag is supported by snapshot.org and will not waste gas on lookup
• it will be better to support multiple governance tokens by a single contract to avoid deployment gas costs
• there is no need for OwnerInitialized event as Ownable emits OwnershipTransferred on construction
• do not include test methods into prod version inherit a test/mock contract and put such methods there

[CjHare]

@joigno ^^^