Merge development into plugin-auth

src/main/java/emu/grasscutter/auth/AuthenticationSystem.java

@@ -27,6 +27,13 @@ public interface AuthenticationSystem {
      */
     void resetPassword(String username);
 
+    /**
+     * Called by plugins to internally verify a user's identity.
+     * @param details A unique, one-time token to verify the user.
+     * @return True if the user is verified, False otherwise.
+     */
+    boolean verifyUser(String details);
+
     /**
      * This is the authenticator used for password authentication.
      * @return An authenticator.