move ServerPingTask in its own file

launcher/ui/pages/instance/ServerPingTask.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <QObject>
+#include <QString>
+
+#include <tasks/Task.h>
+
+
+class ServerPingTask : public Task {
+    Q_OBJECT
+  public:
+    explicit ServerPingTask(QString domain, int port) : Task(), m_domain(domain), m_port(port) {}
+    ~ServerPingTask() override = default;
+    int m_outputOnlinePlayers = -1;
+
+  private:
+    QString m_domain;
+    int m_port;
+
+  protected:
+    virtual void executeTask() override;
+};