Simplify Encryptor API Surface

At least, the portion of it that we use.

Moved salting within the encryptor, so it does not need to be managed externally.

KeyringController now caches the password instead of a passwordDerivedKey, since it is ignorant of the salt.

Encryptor payload is now in a JSON format, so its portions are both base64 encoded *and* labeled appropriately.  The format is `{ "data": "0x0", "iv": "0x0", "salt": "string" }`.

Fixes #843
Fixes #859

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