Rename util.js to uhk.js and refactor the dependent scripts to utilize its API.

usb/uhk.js

@@ -0,0 +1,50 @@
+let usb = require('usb');
+
+exports = module.exports = {
+    getUsbEndpoints: () => {
+        let vid = 0x16d3;
+        let pid = 0x05ea;
+
+        let device = usb.findByIds(vid, pid);
+        device.open();
+
+        let usbInterface = device.interface(0);
+
+        // https://github.com/tessel/node-usb/issues/147
+        // The function 'isKernelDriverActive' is not available on Windows and not even needed.
+        if (process.platform !== 'win32' && usbInterface.isKernelDriverActive()) {
+            usbInterface.detachKernelDriver();
+        }
+        usbInterface.claim();
+
+        let endpointIn = usbInterface.endpoints[0];
+        let endpointOut = usbInterface.endpoints[1];
+        return [endpointIn, endpointOut];
+    },
+
+    usbCommands: {
+        getProperty: 0,
+        jumpToBootloader: 1,
+        setTestLed: 2,
+        writeLedDriver: 3,
+        readLedDriver: 4,
+        writeEeprom: 5,
+        readEeprom: 6,
+        readMergeSensor: 7,
+        uploadConfig: 8,
+        applyConfig: 9,
+        setLedPwm: 10
+    },
+
+    bufferToString: buffer => {
+        let str = '';
+        for (let i = 0; i < buffer.length; i++) {
+            let hex = buffer[i].toString(16) + ' ';
+            if (hex.length <= 2) {
+                hex = '0' + hex;
+            }
+            str += hex;
+        };
+        return str;
+    }
+}