[x] Migrated to new accounts backend.
[x] Seed relevance API.
[x] Orchard enabled in backend and integrated into SDK.
~~Payments to TEX addresses supported.~~
~~Deprecated payment APIs either removed or returning an error with TEX addresses.~~

Author

[ ] Self-review: Did you review your own code in GitHub's web interface? Code often looks different when reviewing the diff in a browser, making it easier to spot potential bugs.
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[ ] Documentation: Did you update Docs as appropiate? (E.g README.md, etc.)
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Reviewer

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[ ] Automated tests: Did you review the automated tests?
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[ ] How is Code Coverage affected by this PR? _We encourage you to compare coverage befor and after your changes and when possible, leave it in a better place. Learn More..._
[ ] Documentation: Did you review Docs, README.md, LICENSE.md, and Architecture.md as appropriate?
[ ] Run the app: Did you run the app and try the changes? While the CI server runs the app to look for build failures or crashes, humans running the app are more likely to notice unexpected log messages, UI inconsistencies, or bad output data.