Create PlayerRelativeControl.js

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// PlayerRelativeControl.js
// Penelope iPhone Tutorial
//
// PlayerRelativeControl creates a control scheme similar to what
// might be found in a 3rd person, over-the-shoulder game found on
// consoles. The left stick is used to move the character, and the
// right stick is used to rotate the character. A quick double-tap
// on the right joystick will make the character jump.
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