[TIMOB-26377] Android: Allow non-https requests to work when targeting Android P

*Summary:* An Android P device will block cleartext "http" requests by default for apps that target Android P. https://developer.android.com/training/articles/security-config#CleartextTrafficPermitted The Java HttpUrlConnection on Android P will throw the following exception when attempt to do a non-https request...

java.io.IOException: Cleartext HTTP traffic to raw.githubusercontent.com not permitted

*Steps to reproduce:*

Set up "tiapp.xml" to target API Level 28.

Acquire an Android P device that has Internet access.

Build and run [^HttpGetTest.js] on the Android P device.

Tap on the "HTTP Get" button.

Notice that you get a "Cleartext HTTP traffic to not permitted" error.

*Note:* This is also an issue with a WebView loading "http:" pages too. Can be reproduced with the following...

var window = Ti.UI.createWindow();
window.add(Ti.UI.createWebView({ url: "http://www.google.com" }));
window.open();

*Possible Solution:* Simplest solution may be to set the following "AndroidManifest.xml" <application> attribute "android:usesCleartextTraffic" to true for all Titanium built apps by default. This way apps are backward compatible. But allow the Titanium developer to set this to false in the "tiapp.xml". https://developer.android.com/guide/topics/manifest/application-element#usesCleartextTraffic Example...

<manifest>
	<application android:usesCleartextTraffic="true"/>
</manifest>