Instead of implicitely reconstructing whether the intent was
intended (lol) to be a timestamp change, we create a new kind of
intent that *only* sets the data we need to switch to a new timestamp.
This means that the logic of what to do (opening a popup player) gets
moved from `InternalUrlsHandler.playOnPopup` to the
`Player.handleIntent` method, we only pass that we want to jump to a
new timestamp. Thus, the stream is now loaded *after* sending the
intent instead of before sending.
This is somewhat messy right now and still does not fix the issue of
queue deletion, but from now on the queue logic should get more
straightforward to implement.
In the end, everything should be a giant switch. Thus we don’t
fall-through anymore, but run the post-setup code manually by calling
`handeIntentPost` and then returning.
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