Add a speed field editor

libs/core/ns.ts

@@ -1 +1,14 @@
 
+namespace motors {
+
+    /**
+     * A speed picker
+     * @param speed the speed
+     */
+    //% blockId=motorSpeedPicker block="%speed" shim=TD_ID
+    //% speed.fieldEditor="speed" colorSecondary="#FFFFFF"
+    //% weight=0 blockHidden=1
+    export function __speedPicker(speed: number): number {
+        return speed;
+    }
+}