global: get rid of nonnull gradle hack

Hacking things up via gradle is not right, and package-info.java poses
problems with two modules, so instead we just apply it manually to every
class.

Remember to add this to new classes!

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/util/AsyncWorker.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.os.Handler;
 
 import java.util.concurrent.Executor;
@@ -16,6 +18,7 @@ import java9.util.concurrent.CompletionStage;
  * Helper class for running asynchronous tasks and ensuring they are completed on the main thread.
  */
 
+@NonNullForAll
 public class AsyncWorker {
     private final Executor executor;
     private final Handler handler;

ui/src/main/java/com/wireguard/android/util/ClipboardUtils.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.content.Context;
@@ -16,6 +18,7 @@ import android.widget.TextView;
  * Standalone utilities for interacting with the system clipboard.
  */
 
+@NonNullForAll
 public final class ClipboardUtils {
     private ClipboardUtils() {
         // Prevent instantiation

ui/src/main/java/com/wireguard/android/util/DownloadsFileSaver.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Context;
@@ -22,6 +24,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 
+@NonNullForAll
 public class DownloadsFileSaver {
 
     public static class DownloadsFile {

ui/src/main/java/com/wireguard/android/util/ErrorMessages.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.res.Resources;
 import android.os.RemoteException;
 
@@ -29,6 +31,7 @@ import java.util.Map;
 
 import java9.util.Maps;
 
+@NonNullForAll
 public final class ErrorMessages {
     private static final Map<BadConfigException.Reason, Integer> BCE_REASON_MAP = new EnumMap<>(Maps.of(
             BadConfigException.Reason.INVALID_KEY, R.string.bad_config_reason_invalid_key,

ui/src/main/java/com/wireguard/android/util/ExceptionLoggers.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 import android.util.Log;
 

ui/src/main/java/com/wireguard/android/util/FragmentUtils.java

@@ -4,12 +4,15 @@
  */
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.Context;
 import androidx.preference.Preference;
 import android.view.ContextThemeWrapper;
 
 import com.wireguard.android.activity.SettingsActivity;
 
+@NonNullForAll
 public final class FragmentUtils {
     private FragmentUtils() {
         // Prevent instantiation

ui/src/main/java/com/wireguard/android/util/ObservableKeyedArrayList.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.databinding.ObservableArrayList;
 import androidx.annotation.Nullable;
 
@@ -21,6 +23,7 @@ import java.util.Objects;
  * operations, require O(n) time.
  */
 
+@NonNullForAll
 public class ObservableKeyedArrayList<K, E extends Keyed<? extends K>>
         extends ObservableArrayList<E> implements ObservableKeyedList<K, E> {
     @Override

ui/src/main/java/com/wireguard/android/util/ObservableKeyedList.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.databinding.ObservableList;
 
 import com.wireguard.util.Keyed;
@@ -14,6 +16,7 @@ import com.wireguard.util.KeyedList;
  * A list that is both keyed and observable.
  */
 
+@NonNullForAll
 public interface ObservableKeyedList<K, E extends Keyed<? extends K>>
         extends KeyedList<K, E>, ObservableList<E> {
 }

ui/src/main/java/com/wireguard/android/util/ObservableSortedKeyedArrayList.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 
 import com.wireguard.util.Keyed;
@@ -26,6 +28,7 @@ import java.util.Spliterator;
  * key still require O(n) time.
  */
 
+@NonNullForAll
 public class ObservableSortedKeyedArrayList<K, E extends Keyed<? extends K>>
         extends ObservableKeyedArrayList<K, E> implements ObservableSortedKeyedList<K, E> {
     @Nullable private final Comparator<? super K> comparator;

ui/src/main/java/com/wireguard/android/util/ObservableSortedKeyedList.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.NonNullForAll;
+
 import com.wireguard.util.Keyed;
 import com.wireguard.util.SortedKeyedList;
 
@@ -12,6 +14,7 @@ import com.wireguard.util.SortedKeyedList;
  * A list that is both sorted/keyed and observable.
  */
 
+@NonNullForAll
 public interface ObservableSortedKeyedList<K, E extends Keyed<? extends K>>
         extends ObservableKeyedList<K, E>, SortedKeyedList<K, E> {
 }