Audit Fixes

[zobront]

Lack of TX Ordering:

• Changed salt to nonce, pulled from storage on the wallet.
• Increment nonce during all transactions.
• Updated EIP712 typehashes to match.

EIP712 Compliance:

• Removed spaces from typehash.

Airdropper Transfer

• Changed to a call. Not worried about gas usage, so didn't limit.

KeyID Dirty Bits

• Pull 32 bytes instead of 8 bytes from code, which we know must always be zero.

Zero Free Mem

• Set salt = 0 during deployment.

Wrong Revert

• Use mstore8 instead of mstore.

Deploy 1167 Issues

• Remove empty byte by switching to 0x8C.
• Update length to 0x35 in the constructor code
• Change offset to read Key ID to 0x2d.
• Update predictAddress() to match.
• Tests passing.

Don't plan to support signer removal or delegate calls, so no changes based on those recommendations.