`clef` is a great tool, however:
* It is no longer maintained
* No one else in the team can pronounce it properly
We are however receiving some slop PRs for it, so I think it's time -
with infinite sadness - to say goodbye.
* accounts, signer: implement gnosis safe support
* common/math: add type for marshalling big to dec
* accounts, signer: properly sign gnosis requests
* signer, clef: implement account_signGnosisTx
* signer: fix auditlog print, change rpc-name (signGnosisTx to signGnosisSafeTx)
* signer: pass validation-messages/warnings to the UI for gnonsis-safe txs
* signer/core: minor change to validationmessages of typed data
