Custom Avatars

[robertlong]

This is a work in progress PR. It re-enables setting an avatar in your user profile. However, instead of using profile rooms we use the account data API for private profile info. This is one less Third Room-specific room we need to create and storing avatar model info in account data is a good use of the account data API. Currently the avatar model url is logged to the console when you enter the room. We probably want to fetch the avatar url for all users when they join by using their peer id and the world member state event (org.matrix.msc3815.world.member).

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