Adds FavoredEnemyFeat getter (#766)

* ELC validation failure check on 4th level ability gain

Throws a validation failure if the PC did not gain an ability point every 4th level

* Adds FavoredEnemyFeat getter

Adds FavoredEnemyFeat getter

---------

Co-authored-by: Chim <chimaera.no.saki@mail.com>
Co-authored-by: Jhett Black <10942655+jhett12321@users.noreply.github.com>

NWN.Anvil/src/main/API/Ruleset/NwRace.cs

@@ -150,5 +150,14 @@ public bool IsFirstLevelGrantedFeat(NwFeat feat)
     {
       return raceInfo.IsFirstLevelGrantedFeat(feat.Id).ToBool();
     }
+
+    /// <summary>
+    /// Gets that race favored enemy feat.
+    /// </summary>
+    /// <returns>The default favored enemy feat for that race, otherwise null.</returns>
+    public NwFeat? GetFavoredEnemyFeat()
+    {
+      return NwFeat.FromFeatId(raceInfo.m_nFavoredEnemyFeat);
+    }
   }
 }