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/activity/BaseActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.databinding.CallbackRegistry;
 import androidx.databinding.CallbackRegistry.NotifierCallback;
 import android.os.Bundle;
@@ -19,6 +21,7 @@ import java.util.Objects;
  * Base class for activities that need to remember the currently-selected tunnel.
  */
 
+@NonNullForAll
 public abstract class BaseActivity extends ThemeChangeAwareActivity {
     private static final String KEY_SELECTED_TUNNEL = "selected_tunnel";
 

ui/src/main/java/com/wireguard/android/activity/MainActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.os.Bundle;
@@ -31,6 +33,7 @@ import java.util.List;
  * editing the configuration and interface state of WireGuard tunnels.
  */
 
+@NonNullForAll
 public class MainActivity extends BaseActivity
         implements FragmentManager.OnBackStackChangedListener {
     @Nullable private ActionBar actionBar;

ui/src/main/java/com/wireguard/android/activity/SettingsActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
@@ -30,6 +32,7 @@ import java.util.List;
  * Interface for changing application-global persistent settings.
  */
 
+@NonNullForAll
 public class SettingsActivity extends ThemeChangeAwareActivity {
     private final SparseArray<PermissionRequestCallback> permissionRequestCallbacks = new SparseArray<>();
     private int permissionRequestCounter;

ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.os.Build;
@@ -18,6 +20,7 @@ import com.wireguard.android.Application;
 
 import java.lang.reflect.Field;
 
+@NonNullForAll
 public abstract class ThemeChangeAwareActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
     private static final String TAG = "WireGuard/" + ThemeChangeAwareActivity.class.getSimpleName();
 

ui/src/main/java/com/wireguard/android/activity/TunnelCreatorActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import android.os.Bundle;
 import androidx.annotation.Nullable;
 
@@ -15,6 +17,7 @@ import com.wireguard.android.model.ObservableTunnel;
  * Standalone activity for creating tunnels.
  */
 
+@NonNullForAll
 public class TunnelCreatorActivity extends BaseActivity {
     @Override
     @SuppressWarnings("UnnecessaryFullyQualifiedName")

ui/src/main/java/com/wireguard/android/activity/TunnelToggleActivity.java

@@ -5,6 +5,8 @@
 
 package com.wireguard.android.activity;
 
+import com.wireguard.util.NonNullForAll;
+
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
@@ -24,6 +26,7 @@ import com.wireguard.android.backend.Tunnel.State;
 import com.wireguard.android.util.ErrorMessages;
 
 @RequiresApi(Build.VERSION_CODES.N)
+@NonNullForAll
 public class TunnelToggleActivity extends AppCompatActivity {
     private static final String TAG = "WireGuard/" + TunnelToggleActivity.class.getSimpleName();