yuzu: Move GameListWorker to its own source files

This has gotten sufficiently large enough to warrant moving it to its
own source files. Especially given it dumps the file_sys headers around
code that doesn't use it for the most part.

This'll also make it easier to introduce a type alias for the
compatibility list, so a large unordered_map type declaration doesn't
need to be specified all the time (we don't want to propagate the
game_list_p.h include via the main game_list.h header).

src/yuzu/game_list_worker.h

@@ -0,0 +1,72 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <map>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include <QList>
+#include <QObject>
+#include <QRunnable>
+#include <QString>
+
+#include "common/common_types.h"
+
+class QStandardItem;
+
+namespace FileSys {
+class NCA;
+class VfsFilesystem;
+} // namespace FileSys
+
+/**
+ * Asynchronous worker object for populating the game list.
+ * Communicates with other threads through Qt's signal/slot system.
+ */
+class GameListWorker : public QObject, public QRunnable {
+    Q_OBJECT
+
+public:
+    GameListWorker(
+        std::shared_ptr<FileSys::VfsFilesystem> vfs, QString dir_path, bool deep_scan,
+        const std::unordered_map<std::string, std::pair<QString, QString>>& compatibility_list);
+    ~GameListWorker() override;
+
+    /// Starts the processing of directory tree information.
+    void run() override;
+
+    /// Tells the worker that it should no longer continue processing. Thread-safe.
+    void Cancel();
+
+signals:
+    /**
+     * The `EntryReady` signal is emitted once an entry has been prepared and is ready
+     * to be added to the game list.
+     * @param entry_items a list with `QStandardItem`s that make up the columns of the new entry.
+     */
+    void EntryReady(QList<QStandardItem*> entry_items);
+
+    /**
+     * After the worker has traversed the game directory looking for entries, this signal is emitted
+     * with a list of folders that should be watched for changes as well.
+     */
+    void Finished(QStringList watch_list);
+
+private:
+    void AddInstalledTitlesToGameList();
+    void FillControlMap(const std::string& dir_path);
+    void AddFstEntriesToGameList(const std::string& dir_path, unsigned int recursion = 0);
+
+    std::shared_ptr<FileSys::VfsFilesystem> vfs;
+    std::map<u64, std::shared_ptr<FileSys::NCA>> nca_control_map;
+    QStringList watch_list;
+    QString dir_path;
+    bool deep_scan;
+    const std::unordered_map<std::string, std::pair<QString, QString>>& compatibility_list;
+    std::atomic_bool stop_processing;
+};