[desktop] Add icon-only mode to grid and improve design (#3485)

- Move Game Icon Size to the main toolbar. It's cleaner that way
- Add a "Show Game Name" toggle that does as it says. Disabling it
  basically creates an "icons-only" mode. Useful for controller-only
  nav with big icons (TODO: maybe make a 192 size?)
- Fixed a crash with controller nav. Oops
- Rounded corners of the game icon in grid mode
- Fixed the scroll bar creating extra clamping range on the grid icons
- Item can be deselected if user clicks on the blank space outside of the view

As a bonus fixed a crash on mod manager

Future TODOs for design:
- [ ] Row 1 type. Not sure what to do here tbh.
- [ ] Move around game list settings in configure_ui to make it clear
  that nothing there affects the grid view.
- [ ] 192x192 size? 256 feels too big on my 1440p screen whereas 128
  feels too small.
- Set text space as a function of fontMetrics.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3485
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

src/yuzu/main_window.h

@@ -15,6 +15,7 @@
 #include <QPushButton>
 #include <QTimer>
 #include <QTranslator>
+#include <qaction.h>
 
 #include "common/common_types.h"
 #include "common/settings_enums.h"
@@ -407,6 +408,9 @@ private slots:
     void SetGridView();
     void SetTreeView();
 
+    void CheckIconSize();
+    void ToggleShowGameName();
+
     void LaunchFirmwareApplet(u64 program_id, std::optional<Service::NFP::CabinetMode> mode);
     void OnCreateHomeMenuDesktopShortcut();
     void OnCreateHomeMenuApplicationMenuShortcut();
@@ -532,6 +536,8 @@ private:
 
     QString startup_icon_theme;
 
+    QActionGroup *game_size_actions;
+
     // Debugger panes
     ControllerDialog* controller_dialog = nullptr;