Implement DestructibleInterface for Owners Packages

Summary:
Fixes T9945. This is straightforward.

The two sub-object types are very lightweight so I just deleted them directly instead of loading + delete()'ing (or implementing DestructibleInterface on them, which would require they have PHIDs).

Also improve a US English localization.

Test Plan:
  - Used `bin/remove destroy PHID-... --trace` to destroy a package.
  - Verified it was gone.
  - Inspected the SQL in the log for general reasonableness.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9945

Differential Revision: https://secure.phabricator.com/D14729

src/__phutil_library_map__.php

@@ -6784,6 +6784,7 @@ phutil_register_library_map(array(
       'PhabricatorPolicyInterface',
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorCustomFieldInterface',
+      'PhabricatorDestructibleInterface',
     ),
     'PhabricatorOwnersPackageDatasource' => 'PhabricatorTypeaheadDatasource',
     'PhabricatorOwnersPackageEditEngine' => 'PhabricatorEditEngine',

src/applications/owners/storage/PhabricatorOwnersPackage.php

@@ -5,7 +5,8 @@ final class PhabricatorOwnersPackage
   implements
     PhabricatorPolicyInterface,
     PhabricatorApplicationTransactionInterface,
-    PhabricatorCustomFieldInterface {
+    PhabricatorCustomFieldInterface,
+    PhabricatorDestructibleInterface {
 
   protected $name;
   protected $originalName;
@@ -338,4 +339,30 @@ final class PhabricatorOwnersPackage
     return $this;
   }
 
+
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
+
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+
+    $this->openTransaction();
+      $conn_w = $this->establishConnection('w');
+
+      queryfx(
+        $conn_w,
+        'DELETE FROM %T WHERE packageID = %d',
+        id(new PhabricatorOwnersPath())->getTableName(),
+        $this->getID());
+
+      queryfx(
+        $conn_w,
+        'DELETE FROM %T WHERE packageID = %d',
+        id(new PhabricatorOwnersOwner())->getTableName(),
+        $this->getID());
+
+      $this->delete();
+    $this->saveTransaction();
+  }
+
 }

src/infrastructure/internationalization/translation/PhabricatorUSEnglishTranslation.php

@@ -1501,6 +1501,11 @@ final class PhabricatorUSEnglishTranslation
 
       '%s updated %s for %s, added %s: %s; removed %s: %s.' =>
         '%s updated %s for %s, added: %5$s; removed; %7$s.',
+
+      'Permanently destroyed %s object(s).' => array(
+        'Permanently destroyed %s object.',
+        'Permanently destroyed %s objects.',
+      ),
     );
   }