add android integration & make iOS API consistent

add pubspec android plugin

update android CMakeLists

add filament android libs for linking

example/android/app/src/main/AndroidManifest.xml

@@ -1,8 +1,11 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="app.polyvox.polyvox_filament_example">
+    package="app.polyvox.filament_example">
    <application
+        android:name="${applicationName}"
         android:label="polyvox_filament_example"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/ic_launcher"
+        android:theme="@android:style/Theme.Translucent.NoTitleBar"
+        >
         <activity
             android:name=".MainActivity"
             android:launchMode="singleTop"