添加商店内弹出窗消息

使用SpkUiMessage::SendStoreNotification激活，必须在SpkStore构造函数加载完全局SpkPopup类之后才可
使用。

inc/spkpopup.h

@@ -0,0 +1,30 @@
+
+#pragma once
+
+#include <QLabel>
+#include <QWidget>
+#include <QHBoxLayout>
+#include <QPropertyAnimation>
+#include <QSequentialAnimationGroup>
+
+class SpkMainWindow;
+
+namespace SpkUi
+{
+  class SpkPopup : public QWidget
+  {
+      Q_OBJECT
+    public:
+      SpkPopup(QWidget *parent, int aMillis = 3000);
+
+    public slots:
+      void Show(QString aText);
+
+    private:
+      QPoint MoveOffset;
+      QLabel *mText;
+      QHBoxLayout *mBox;
+      QPropertyAnimation *mAnimFadeIn, *mAnimFadeOut;
+      QSequentialAnimationGroup *mAnim;
+  };
+}