This feature adds the replying indicator in threads, it uses the same `/chat-reply/CHANNEL_ID` prefix than the channel composer replying indicator as we don't have specific right on threads ATM (if you can access channel, you can access thread). Thread will however use a presence channel name of the following format: `/chat-reply/CHANNEL_ID/thread/THREAD_ID`
This commit also simplifies the computation of `users` to eventually avoid a race-condition leading to a leak of the indicator in another channel/thread.
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- correctly subscribe/unsubscribe channel
- instantly changes users list
- adds a test for testing channel change
- rewrites tests to be less verbose
- ensures users is always an array
- `ChatChannel`
- `UserChatChannelMembership`
Also creates a new `chat-direct-message` model used as the object for the`chatable` property of the `ChatChannel` when the `ChatChannel` is a direct message channel. When the chatable is a category a real `Category` object will now be returned.
Archive state of a `ChatChannel` is now hold in a `ChatChannelArchive` object.
1. `test()` and `render()` instead of `componentTest()`
2. Angle brackets
3. `strictEqual()`/`true()`/`false()` assertions
This removes all remaining uses of `componentTest` from core