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[#1071] Actor.within checks from geometry surface (#1157)

Closes #1071

## Changes:

- Change `within` to use object geometry instead of the center
- Added a `getClosestLineBetween` method to `CollisionShape`'s for return the closest line
- Added a visual test
- Added unit tests

![closest](https://user-images.githubusercontent.com/612071/58705826-ec470380-8375-11e9-8b7d-7d1c47fd79de.gif)

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