citra_qt: Rebuilt movie frontend

This is completely rebuilt, in order to allow setting author, displaying movie metadata, and toggling read-only mode.

The UX is changed to more closely match other emulators' behaviour. Now you can only record/play from start/reset (In the future, we might want to introduce 'record from savestate')

Also fixed a critical bug where movie file can be corrupted when ending the recording while game is still running.

src/citra_qt/movie/movie_play_dialog.h

@@ -0,0 +1,30 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include <QDialog>
+
+class GameList;
+
+namespace Ui {
+class MoviePlayDialog;
+}
+
+class MoviePlayDialog : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit MoviePlayDialog(QWidget* parent, GameList* game_list);
+    ~MoviePlayDialog() override;
+
+    QString GetMoviePath() const;
+    QString GetGamePath() const;
+
+private:
+    void OnToolButtonClicked();
+    void UpdateUIDisplay();
+
+    std::unique_ptr<Ui::MoviePlayDialog> ui;
+    GameList* game_list;
+};