Apps: upgrade to CIDv1 URLs if CIDv0 content is found

[sohkai]

IPFS 0.5/0.6 has migrated to defaulting to CIDv1 (encoded in base32, rather than CIDv0's base58) to support subdomains.

Gateways should continue redirecting from the old CIDv0 to CIDv1 for the foreseeable future, but we can improve performance by avoiding this redirect by doing the conversion ourselves when we detect a CIDv0 hash.

We can use two tools (combined for about ~60kbs):

• is-ipfs to detect IPFS content
• cid-tool for converting from CIDv0 to CIDv1