Further tweaks to MxcReply

- QNetworkReply::isSequential() already returns `true`, there's no need
to overload it again.
- Use `Q_SLOTS` instead of `slots` because it's an external library
  interface and clients may use other libraries using `slots` identifier;
- Use `emit` instead of `Q_EMIT` because this is a part of internal
  implementation and if we ever use a library that has an `emit`
  identifier, a massive search-replace will be in order anyway.
- Use `QMetaObject::invokeMethod()` with a queued connection as
  a clearer way to achieve the same goal as `QTimer::singleShot(0, ...)`.

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