feat: add MultipleOptionsTask

This is a variation of a Sequential Task, in which a subtask failing
will prompt the next one to execute, and a subtask being successful will
stop the task.

This way, this can be used for easily managing fallbacks with tasks. :D

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/tasks/MultipleOptionsTask.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "SequentialTask.h"
+
+/* This task type will attempt to do run each of it's subtasks in sequence,
+ * until one of them succeeds. When that happens, the remaining tasks will not run.
+ * */
+class MultipleOptionsTask : public SequentialTask
+{
+    Q_OBJECT
+public:
+    explicit MultipleOptionsTask(QObject *parent = nullptr, const QString& task_name = "");
+    virtual ~MultipleOptionsTask() = default;
+
+private
+slots:
+    void startNext() override;
+    void subTaskFailed(const QString &msg) override;
+};