Makes sure to cancel placing events when a permission sign is interacted with

src/main/java/net/knarcraft/permissionsigns/listener/SignListener.java

@@ -50,7 +50,7 @@ public class SignListener implements Listener {
         }
 
         Sign sign = (Sign) block.getState();
-        handleSignClick(sign, player, event.getAction());
+        handleSignClick(sign, player, event.getAction(), event);
     }
 
     /**
@@ -59,8 +59,9 @@ public class SignListener implements Listener {
      * @param sign   <p>The clicked sign</p>
      * @param player <p>The player that clicked the sign</p>
      * @param action <p>The hand the player used to interact with the sign</p>
+     * @param event  <p>The player interact event which was triggered</p>
      */
-    private void handleSignClick(Sign sign, Player player, Action action) {
+    private void handleSignClick(Sign sign, Player player, Action action, PlayerInteractEvent event) {
         //Check if the sign is a registered permission sign
         PermissionSign permissionSign = SignManager.getSign(sign.getLocation());
         if (permissionSign != null) {
@@ -72,6 +73,7 @@ public class SignListener implements Listener {
                 return;
             }
             if (player.isSneaking()) {
+                event.setCancelled(true);
                 handlePermissionSignInteract(permissionSign, player);
             } else {
                 player.sendMessage(getSignInfoText(permissionSign));

src/main/java/net/knarcraft/permissionsigns/utility/FileHelper.java

@@ -9,7 +9,11 @@ import java.nio.charset.StandardCharsets;
 /**
  * A helper class for dealing with files
  */
-public class FileHelper {
+public final class FileHelper {
+
+    private FileHelper() {
+
+    }
 
     /**
      * Gets a buffered reader for