feat(ui): add custom MSA client id setting

launcher/ui/pages/global/APIPage.h

@@ -0,0 +1,60 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui {
+class APIPage;
+}
+
+class APIPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit APIPage(QWidget *parent = 0);
+    ~APIPage();
+
+    QString displayName() const override
+    {
+        return tr("APIs");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("worlds");
+    }
+    QString id() const override
+    {
+        return "apis";
+    }
+    QString helpPage() const override
+    {
+        return "APIs";
+    }
+    virtual bool apply() override;
+
+private:
+    void loadSettings();
+    void applySettings();
+
+private:
+    Ui::APIPage *ui;
+};
+