[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.cpp

@@ -5,6 +5,7 @@
 
 #include "common/memory_detect.h"
 #include "core/hle/service/filesystem/filesystem.h"
+#include "frontend_common/data_manager.h"
 #include "hid_core/hid_core.h"
 #include "network/network.h"
 #include "qt_common.h"
@@ -27,6 +28,7 @@
 
 #include <thread>
 #include <JlCompress.h>
+#include <QPainter>
 
 #if !defined(WIN32) && !defined(__APPLE__)
 #include <qpa/qplatformnativeinterface.h>
@@ -307,4 +309,19 @@ void SetupHID() {
     system->HIDCore().ReloadInputDevices();
 }
 
+QString ReadableByteSize(qulonglong size) {
+    return QString::fromStdString(FrontendCommon::DataManager::ReadableBytesSize(size));
+}
+
+QPixmap CreateCirclePixmapFromColor(const QColor& color) {
+    QPixmap circle_pixmap(16, 16);
+    circle_pixmap.fill(Qt::transparent);
+    QPainter painter(&circle_pixmap);
+    painter.setRenderHint(QPainter::Antialiasing);
+    painter.setPen(color);
+    painter.setBrush(color);
+    painter.drawEllipse({circle_pixmap.width() / 2.0, circle_pixmap.height() / 2.0}, 7.0, 7.0);
+    return circle_pixmap;
+}
+
 } // namespace QtCommon