Important Engine Fixes

[bryanedds]

This time, we've surfaced some important engine bugs and fixed them. See the changes below!

Additional changes -

• Fixed World.sweepSimulants not being called when world halted (fixed ImNui not destroying dead simulant when editor is halted).
• Added HACK to fix property edit exception.
• Got rid of hack by moving non-model property fix-ups lower.
• Prevented invalid surface index values from creeping into physics system.
• Fixed Need to give StaticCompoundShapeSettings a single EmptyShapeSettings instance when it has no children or AVE crash. #937
• Fixed regression from recent fix.
• Updated DotRecast to latest official release.
• Tuned stair step defaults.

Full Changelog: v18.1.0...v18.2.0

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