* Implement Client Status Support
Adds support for using the client_status as sent as part of the Presence model. This value can be used to determine if a user is active on the native desktop app, the mobile app, or the website.
* lint: whitespace in IPresence
* Remove breaking change to IPresence interface with a note for 2.1
* update comment to not reference 2.1
* re-add interface break to IPresence
* add example payload for client_status
* use inline declaration for Enum.TryParse
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