qt_gui: Some game install features and fixes (#2261)

* open update folder + delete save folder + bulk install checkbox

* delete pkg on install checkbox + use game icon for finish window

src/qt_gui/main_window.h

@@ -123,4 +123,8 @@ protected:
     }
 
     void resizeEvent(QResizeEvent* event) override;
+
+    std::filesystem::path last_install_dir = "";
+    bool delete_file_on_install = false;
+    bool use_for_all_queued = false;
 };