[w3c/gamepad] Light Indicator (#67)

Many controllers support the concept of a light indicator to represent the player index of a controller. This is helpful to the user to know which player character is being controlled without testing each controller.  Additionally, some games are only playable using a controller with a specific player index. In the context of VR, controllers may support a light indicator to assist the application in determining the location of the player. Light indicators range from monochrome light indicators (ON/OFF) to RGB light indicators.  

We'd like to bring gamepad extension support to the same level of support provided by native functionality with the following proposal: [Light Indicator Proposal](https://github.com/knyg/gamepad/commit/cafe2dd405038d9dc25d852d1c4a61b03b3381db)

Please let us know if you have any questions, comments, or feedback.

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