LightsService cleanup:

Add Light subclass to replace LightsService light setting methods
Remove LightsService.setAttentionLight() and LightsService.pulseBreathingLight()
Add support for Wifi and Bluetooth lights

Change-Id: I707f53cda27481c25649f402567a665d52e9cb62
Signed-off-by: Mike Lockwood <lockwood@android.com>