Enable login by any attribute - defaults to uid.

Implements #253

app/Http/Controllers/Auth/LoginController.php

@@ -45,7 +45,7 @@ class LoginController extends Controller
 	protected function credentials(Request $request): array
 	{
 		return [
-			'mail' => $request->get('email'),
+			login_attr_name() => $request->get(login_attr_name()),
 			'password' => $request->get('password'),
 		];
 	}
@@ -91,4 +91,14 @@ class LoginController extends Controller
 
 		return view('architect::auth.login')->with('login_note',$login_note);
 	}
+
+	/**
+	 * Get the login username to be used by the controller.
+	 *
+	 * @return string
+	 */
+	public function username()
+	{
+		return login_attr_name();
+	}
 }