User: optimise names/avatars storing and updating

The current mechanism relied on a complicated and fragile machinery
around setNameForRoom() and setAvatarForRoom() that maintained the
"most used" entity for a given user along with "other" ones. Given that
per-room avatars are pretty rare in Matrix, it's also been inefficient
as kitsune-benchmark-set_ForRoom branch shows. The new mechanism stores
the "default" (as per user profile) name and avatar and maintains
a singleton map of avatar objects across all users. Per-user profile
only (normally) exists for the local user so there's yet another
inefficiency that will be fixed further down the road by introducing
a separate user profile class.

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