Work in progress pull request to implement Stratis Signature Authentication and Stratis Transaction Handoff into the Cirrus Core wallet.

Stratis Signature Authentication

Follows SSAS guidelines for message signature and authentication flows adding a new button to the dashboard view.

Stratis Transaction Handoff

Adds a text input into the smart contract transaction modal, allowing copy/paste QR code functionality into Cirrus Core. Matches in-progress functionality of mobile wallets.

Other Fixes and Improvements

• SVG Loader component removing code duplication
• Integrations Service and implementation of SSAS and Transaction Shortcut callbacks
• Creates shareable getHttpOptions method
• Adds sign message endpoint to api service
• Increased default gasCallRecommendedLimit from 50,000 to 125,000
  • Covers most all Opdex related transactions w/ default gas cost

Future Considerations

• Consider adding a "preview" step to make the local-call of the transaction, resulting in a quote to present to the user and potentially prevent accidental mistakes and wasted gas.
• This PR does not cover token management of UInt256 token balances, token creation, transfers, or allowances