[TIMOB-19081] Android: Add Theme.AppCompat.NoTitleBar to default themes

Every android app we build includes a few [built-in themes](https://github.com/appcelerator/titanium_mobile/blob/master/android/templates/build/theme.xml): * Theme.AppCompat.Fullscreen * Theme.AppCompat.Translucent * Theme.AppCompat.Translucent.NoTitleBar * Theme.AppCompat.Translucent.NoTitleBar.Fullscreen * Theme.Titanium, which extends either Theme.AppCompat directly or Theme.AppCompat.Fullscreen depending on the <fullscreen> setting in tiapp.xml. Strangely enough, it does not include a theme that would cover one of the most common use cases: hiding the Action Bar. Our [guide](http://docs.appcelerator.com/platform/latest/#!/guide/Android_Action_Bar-section-36735509_AndroidActionBar-HidingtheActionBar) explains how to do this using a custom theme, while it could be much simpeler if only we would include one by default. via *tiapp.xml*

 <android xmlns:android="http://schemas.android.com/apk/res/android">
    <manifest>
        <application android:theme="@style/Theme.AppCompat.NoTitleBar"/>
    </manifest>
</android>

or per window:

Ti.UI.createWindow({
  theme: "Theme.AppCompat.NoTitleBar"
}).open();

Ideally, the new themes would follow the same naming convention as the Translucent ones:

	<style name="Theme.AppCompat.NoTitleBar">
		<item name="android:windowNoTitle">true</item>
		<item name="android:windowContentOverlay">@null</item>
		<item name="android:windowActionBar">false</item>
		<!-- AppCompat Compatibility -->
		<item name="windowActionBar">false</item>
	</style>
	
	<style name="Theme.AppCompat.NoTitleBar.Fullscreen">
		<item name="android:windowFullscreen">true</item>
	</style>

	<!-- Legacy Compatibility -->
	<style name="Theme.AppCompat.Fullscreen" parent="@style/Theme.AppCompat.NoTitleBar.Fullscreen" />

As you can see the existing Theme.AppCompat.Fullscreen theme can inherit the new Theme.AppCompat.NoTitleBar so that it is still available under the existing name. With these new themes in place we could also restore the <navbar-hidden> and <fullscreen> elements in tiapp.xml. This would select the Theme.AppCompat.NoTitleBar for <application> or Theme.AppCompat.NoTitleBar.FullScreen theme if <fullscreen> is also true. The attached test app shows how these new themes would work, by adding them via a custom theme.