Standardize hash variable names

[feross]

Right now, in most of the webtorrent modules, we use self.infoHash to store a buffer and self.infoHashHex to store a hex string. But there are a few places like lib/torrent.js where it's actually a hex string.

Same with self.peerId and self.peerIdHex.

We've already standardized on using hex strings at the edges of the various modules, i.e. events that emit infoHashes or peerIds always use hex strings. Functions that take an hash input always accept a hex string OR a buffer.

Let's go hex strings all the way, and make it so the self.infoHash property is always a hex string as well. And we can use self.infoHashBuffer for the buffer version. This will require changes to almost every module.

[imsnif]

Please let me know if I missed anything.

[lock]

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