Use standard IPFS URIs

[jaybuidl]

All the IPFS URIs we have been using since v1 do not conform with the RFC3986 specs for URIs.

❌ /ipfs/QmZ3Cmnip8bmFNruuTuCdxPymEjyK9VcQEyf2beDYcaHaK/metaEvidence.json
✅ ipfs://QmZ3Cmnip8bmFNruuTuCdxPymEjyK9VcQEyf2beDYcaHaK/metaEvidence.json

It should be relatively easy to fix, and we could even have a fallback for backward-compatibility.