Move USB Host Shield and Arduino core to `lib/` (#13973)

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diff --git a/lib/usbhost/USB_Host_Shield_2.0/WiiCameraReadme.md b/lib/usbhost/USB_Host_Shield_2.0/WiiCameraReadme.md
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+Please see <http://wiibrew.org/wiki/Wiimote#IR_Camera> for the complete capabilities of the Wii camera. The IR camera code was written based on the above website and with support from Kristian Lauszus.
+
+This library is large, if you run into memory problems when uploading to the Arduino, disable serial debugging.
+
+To enable the IR camera code, simply set ```ENABLE_WII_IR_CAMERA``` to 1 in [settings.h](settings.h).
+
+This library implements the following settings:
+
+* Report sensitivity mode: 00 00 00 00 00 00 90 00 41	 40 00	 Suggested by inio (high sensitivity)
+* Data Format: Extended mode (0x03).  Full mode is not working yet. The output reports 0x3e and 0x3f need tampering with
+	* In this mode the camera outputs x and y coordinates and a size dimension for the 4 brightest points.
+
+Again, read through <http://wiibrew.org/wiki/Wiimote#IR_Camera> to get an understanding of the camera and its settings.