[desktop] Rework game list to use MVP architecture (#4042)

Closes #3480

moves the game list model/worker/private stuff to qt_common for later
use in QML

- `qt_common/game_list/model.{cpp,h}` is the model
- `yuzu/game/game_{grid,tree}.*` are the views
- `yuzu/game/game_list.cpp` is the presenter

This was done very lazily in a manner that "works" while largely
maintaining existing structure as much as possible. Most of it is
copy-paste, with some bonus reworks/cleanups thrown in.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4042
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/qt_common/qt_common.h

@@ -46,6 +46,20 @@ void SetupHID();
 const QString tr(const char* str);
 const QString tr(const std::string& str);
 
+// TODO: Find a better place for these
+
+/// Convert a size in bytes into a readable format (KiB, MiB, etc.)
+[[nodiscard]] QString ReadableByteSize(qulonglong size);
+
+/**
+ * Creates a circle pixmap from a specified color
+ * @param color The color the pixmap shall have
+ * @return QPixmap circle pixmap
+ */
+[[nodiscard]] QPixmap CreateCirclePixmapFromColor(const QColor& color);
+
+
+
 std::filesystem::path GetEdenCommand();
 } // namespace QtCommon
 #endif