[multiplayer] Add user presence indicators #4666
Merged
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Adds icons to the tabs/nodes to show where other users are in the editor:
Conscious of space, if there are more than two other users in one place, it only shows the first two, plus a count of how many more there are:
Hovering any user icon reveals their name, hovering over the count icon lists all of the users at that location:
Clicking on a user icon (including those in the top header) jumps to where they are in the editor.