Android TV (#933)

* Disable touchscreen requirement

* Add Android TV feature

* Add Android TV draft banner

* Add Android TV check method

client/android/res/mipmap-anydpi-v26/ic_banner.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_banner_background"/>
+    <foreground android:drawable="@mipmap/ic_banner_foreground"/>
+</adaptive-icon>

client/android/res/values/ic_banner_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_banner_background">#1E1E1F</color>
+</resources>