Remove Oraclize integration

• Removed integration with the Oraclize service in the Oracle.sol contract
• Added a gas topup guard to prevent gas topups when the wallet has not enough funds

GasProxy Controller

This release creates a new kind of Controller that utilisies gas tokens to subsidise gas costs. This makes no changes to the wallet, it just allows for transactions to be performed more cheeply.

Proxy / Library Smart Contract Wallet

This version is a minor version change whereby the interfaces to the Wallet do not change, but the wallet has been transformed into a Proxy / Library pattern. This enables some efficiencies on chain.

Wallet Proxies via Upgradeable pattern (pre-audit)

This version of the contracts uses OpenZeppelin's upgradeable pattern:

-proxies are deployed instead of full contracts.

• upgradeTo functionality deactivated.

v3.2.0 - Batch Metatransactions + Migration

This version of the app allows for:

Batch Metatransactions
Contract Migrations

v3.1.1 - Minor / Cosmetic Changes to 3.1.0

Add prettier formatter and format solidity code (#544)

* Add prettier formatter and format solidity code

* Add format script

* Improve format and slither scripts and update README.md

* Regenerate bindings

* Fix test coverage error and use node container

* Add openssh-client to node container

* Fix test coverage for licence.sol

* Add git to format_check job

* Revert build_check changes

v3.1.0 - Batch and Meta Transactions

MetaTransactions
Batch MetaTransactions
Some minor cosmetic changes

Meta Transactions - Post Audit - Prerelease

This pre-release implements:

• Meta-transactions
• Batch executeTransaction
• Wallet Connect Verify Signature

Meta Transactions - Pre Audit

This is the version that we sent off for audit.

Post Audit - Fix Oracle Exchange Rate

This bug was introduced post audit, we are reverting what was recommended by the auditor.