🔨 Switch LiveInfo to use useOvermind

[MichaelDeBoey]

Follow-up of #2878

Things I did extra:

• Change onModeChanged, onLiveMode & sendLiveMode's signature to get its argument types directly from RoomInfo instead of hardcoding them
• Change onAddEditorClicked & onFollow's signature to accept a string instead of { liveUserId: string }, because it only has 1 argument
• Change onRemoveEditorClicked's signature to accept a string instead of { liveUserId: string }, because it only has 1 argument (data is never passed)
• Put all styles into the elements.ts file
• Move overmind subscriptions as close as possible to the components itself instead of passing it through
• Extract FollowButton, LiveMode, MakeEditorButton, MakeSpectatorButton & Preferences from LiveInfo

[lbogdan]

Build for latest commit 5bdd620 is at https://pr3444.build.csb.dev/s/new.

[SaraVieira]

Same idea as #3461