Collision offset changes needed for Editor integration

[yaustar]

Fixes:

• JS docs for linear offset which used to imply that it would be offset in local space. It actually does it in world space but along the Entity's local axes
• On component creation, we accept euler angles as a number array of length 3 as well as a quat of length 4. This makes Editor integration a lot easier as it can store it in the data as a vec3 euler angles. Added benefit (which we should document?) is that at runtime, developers don't have to convert to a quat.

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