Voicechat without spatial audio, and without having to reload the ses…

[Mindgamesnl]

This pull request implements:

• the ability to change the global spatial/static audio on the fly without reloading
• the ability to enable/disable spatial audio on a per-peer level
• the ability to define if spatial audio should be used from the plugin side (login packet)
• the ability to define whether a player should be hidden from the UI, but still audible (login packet)
• a new packet (plugin > client) to update peer metadata without requiring them to reconnect (spatial audio state, and visibility)

[Mindgamesnl]

New client model representation, flexible enough to add more in the future.

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[Mindgamesnl]

This is ready to merge, next step is overhauling the proximity ticker.