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Replace numeric error codes with strings

Fixes https://github.com/share/sharedb/issues/287
Fixes https://github.com/share/sharedb/issues/198

This is a breaking change that moves us from using numeric error codes
to string-based codes [similar to Node][1].

The motivation for this is:

  - more descriptive error codes
  - stop implying that errors can be broadly classified together (in the
    same way that HTTP errors might)

This change also exposes these codes on `ShareDBError.code`, so that
they are easily discoverable, and can be referenced by consumers for
programmatic error handling.

[1]: https://nodejs.org/api/errors.html#nodejs-error-codes

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