0.1.11-feature-branch2

Includes pull request review changes and namely a renaming of websocket message type from:

• paymentrequest.create to paymentterms.create
• paymentrequest.response to paymentterms.response
• paymentrequest.error to paymentterms.error

0.1.11-feature-branch

https://github.com/bitcoin-sv/dpp-proxy/tree/features/update-for-tsc-spec-compliance