Instead of having scene add/remove collision events directly to the OdeScene collision event dictionary, marshall them via a change dictionary first.

This is to avoid a complicated tri-thread deadlock on region crossing for avatars with attachments, where
1) XEngine starting up scripts can lock XEngine.m_Scripts and then try to lock OdeScene._collisionEventPrim while starting up a script due to avatar border crossing
2) An existing collision event will lock OdeScene._collisionEventPrim and then try to lock SP.m_attachments while trying to send the collision event to attachments
3) The avatar still entering the region will lock SP.m_attachments and then try to lock m_Scripts to start more attachment scripts.

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