Gaia user interface enhancements + more fixes!

[bryanedds]

In this release, we have several more engine fixes as well as some interesting new editor features in Gaia -

• Added missing body separation event trigger when setting a body disabled.
• Fixed regression in MMCC code reload.
• Now issuing new code reload event.
• Using new Intersection type for simulant ray casts in order to determine applicability of RayCast override results.
• Fixed issue with concave geometry in 3D physics.
• Implemented EditVolumeDispatcher for performing operations on entities within a volume in Gaia.
• Redesigned 'spatial' attributes to work to properly encapsulate their special interpretation of common attributes.
• Changed rename semantics to include mount changes.
• Added EditVolumeFacet.
• Exposed Entity.GetMounted.
• Fixed drag duplication for 2D entities.
• Added Propagation Sources UI in Gaia.
• Reformulated entity creation in Gaia a bit.

Full Changelog: v18.10.0...v18.11.0

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