Raycasting and contacts feedback

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The abstraction imposes raycasters, and raycast targets. Should be simple to implement. They also need to be able to modify the array of raycast hits on the raycaster for feedback

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This will likely involve a refactor, so might as well batch in collision hit arrays updating on bodies

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raycasting and feedback was implemented in 04bfbb1, works reliably but needs more work:

• should be submitted events instead of entities

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raycasting as events done in 01fb724