Implement Gamedistribution ads using webview

The JS needs to be modified too to make it work. Don’t need to be using atbo / btoa, they both need to be removed to work with Defold’s data. There are other changes which need to be made too but I can’t do right now.

	function stringToUint(string) {
		var string = unescape(encodeURIComponent(string)),
			charList = string.split(''),
			uintArray = [];
		for (var i = 0; i < charList.length; i++) {
			uintArray.push(charList[i].charCodeAt(0));
		}
		return new Uint8Array(uintArray);
	}

	function uintToString(uintArray) {
		var encodedString = String.fromCharCode.apply(null, uintArray),
			decodedString = decodeURIComponent(escape(encodedString));
		return decodedString;
	}