Add missing proguard rules to enable release build

Author: PaulKlauser

app/proguard-rules.pro

@@ -29,4 +29,10 @@
 
 -keepnames class androidx.navigation.fragment.NavHostFragment
 -keepnames class com.willowtree.vocable.room.Category
--keepnames class com.willowtree.vocable.room.Phrase
+-keepnames class com.willowtree.vocable.room.Phrase
+
+-dontwarn com.google.ar.sceneform.animation.AnimationEngine
+-dontwarn com.google.ar.sceneform.animation.AnimationLibraryLoader
+-dontwarn com.google.ar.sceneform.assets.Loader
+-dontwarn com.google.ar.sceneform.assets.ModelData
+-dontwarn com.google.devtools.build.android.desugar.runtime.ThrowableExtension