[MOD-2354] iOS: Replace ZxingWidget Library used in Ti.Barcode with new library, which are getting updated frequently

The Zingwidget library which we are using is either from- https://github.com/anurlybayev/zxing-iphone/tree/master/ZXingWidget or from https://github.com/zxing/zxing/tree/00f634024ceeee591f54e6984ea7dd666fab22ae/iphone/ZXingWidget . Both are updated 4years back only. I think there is no active work on these libraries. So we should use some active library, e.g https://github.com/TheLevelUp/ZXingObjC, where we can create our own UI as given in their example - https://github.com/TheLevelUp/ZXingObjC/tree/master/examples/BarcodeScanner . Some discussion can be found [here](https://github.com/appcelerator-modules/ti.barcode/pull/53).