添加API调用接口，添加读取分类，添加SpkUtils实用函数

使用了SpkSidebarTree子类实现对TreeWidget的特殊要求：不能取消选择，不能拖拽选择。

API调用接口暂时写死。API会获取

配置文件已添加但暂不使用。

inc/spkstore.h

@@ -1,8 +1,9 @@
 
 #pragma once
 
-#include <QMap>
+#include <QJsonDocument>
 #include <QString>
+#include <QSettings>
 #include <QtNetwork/QNetworkReply>
 #include <QtNetwork/QNetworkAccessManager>
 
@@ -20,35 +21,19 @@ class SpkStore : public QObject
     Q_OBJECT
   public:
     static SpkStore *Instance;
+    QSettings *mCfg;
     SpkStore(bool aCli, QString &aLogPath);
     ~SpkStore();
 
     SpkMainWindow* GetRootWindow() { return mMainWindow; }
 
+    void SetApiResuestUrl(QString aUrlStr) { mApiRequestUrl = aUrlStr; }
+    QString GetApiRequestUrl() { return mApiRequestUrl; }
+    QNetworkReply *SendApiRequest(QString path, QJsonDocument param = QJsonDocument());
+
   private:
     SpkLogger *mLogger;
     SpkMainWindow *mMainWindow = nullptr;
-
     QNetworkAccessManager *mNetMgr = nullptr;
-
-  // Following are stationary signal-slot bindings between UI and Store, mostly for handling
-  // API calls and resource downloading.
-  public slots:
-
-//    void RequestStoreMetadata(); ///< All required metadata the store needs when launched
-//    void RequestCategoryPage(int aCategoryId);
-//    void RequestApplicationMetadata(int aAppId);
-//    void RequestRefreshApiUrls(QString aCustomUrl);
-  signals:
-    void StatusStoreMetadata(QNetworkReply::NetworkError, QString);
-    void StatusCategoryPage(QNetworkReply::NetworkError, QString);
-    void StatusApplicationMetadata(QNetworkReply::NetworkError, QString);
-    void StatusRefreshApiUrls(QNetworkReply::NetworkError, QString);
-
-  private:
-    // Store manages all kinds of possible replies, and the caller can only get JSON they need
-    QNetworkReply *mReplyStoreMetadata = nullptr,
-                  *mReplyCategory = nullptr,
-                  *mReplyAppMetadata = nullptr,
-                  *mReplyApiUrls = nullptr;
+    QString mDistroName, mApiRequestUrl, mUserAgentStr;
 };