Add Android TV OS support

[oroboros]

AdGuard already works fine on Android TV, but it needs to be sideloaded.

Since it already works on Android TV, the one thing that is missing is an icon launcher, which can be fixed by adding the following code and a larger size icon:

Source: http://stackoverflow.com/questions/32449904/how-to-make-a-android-tv-app-without-using-leanback-lib
Code:

<uses-feature android:name="android.software.leanback" android:required="false" /> <uses-feature android:name="android.hardware.touchscreen" android:required="false" /> android:banner="@drawable/banner" <category android:name="android.intent.category.LEANBACK_LAUNCHER"/>

Beyond adding the Android TV launcher, there are only a few minor tweaks that need to be made to your code, and almost all of them regard the UI (like a few screens, not all, which are missing the highlight when items are selected and stuff like that):
https://github.com/AdguardTeam/AdguardForAndroid/issues?q=%22android+tv%22

But these are all GUI issues which do not effect functionality. Adding the code above would already make it usable.

[oroboros]

I'm gonna pump this up, considering the new version in development, especially since v4 seems to break a lot of UI issues previously fixed.

[alextallinn]

Not working correctly on my "Sony BRAVIA 4K UR3" Android TV 8.
Incorrectly shown UI, so unable to use it!!!

[redtrillix]

Are we able to get support for the Amazon Fire TV OS?, I've tried with both Nightly and Beta and it's currently not very usable.

[maxikuzmin]

@redtrillix there will be a release today, there will be a separate build for TV, please try it. If you have any problems, please open a new issue