stalwart-mail v0.3.0
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- Merged the `stalwart-jmap`, `stalwart-imap` and `stalwart-smtp` repositories into
  `stalwart-mail`.
- Added support for **LDAP** and **SQL** authentication.
- Added support for **subaddressing** and **catch-all** addresses.
- Added support for **S3-compatible** storage.
- Removed clustering module and replaced it with a **FoundationDB** backend option.
- Integrated Stalwart SMTP into Stalwart JMAP.
- Rewritten JMAP protocol parser.
- Rewritten store backend.
- Rewritten IMAP server to have direct access to the message store (no more IMAP proxy).
- Replaced `actix` with `hyper`.