saves: show the save's ICON0.PNG in the table

The Save column now displays a small (40x32, letterboxed) icon from the
save folder's ICON0.PNG when present, using the first location (PSP,
PPSSPP, cloud) that has one.

app/gui.py

@@ -3376,12 +3376,25 @@ class SavesPage(QWidget):
         self.table.setEditTriggers(QAbstractItemView.NoEditTriggers)
         self.table.setSelectionBehavior(QAbstractItemView.SelectRows)
         self.table.setSortingEnabled(True)
+        self.table.setIconSize(QSize(40, 32))
         self.table.horizontalHeader().setSortIndicator(0, Qt.AscendingOrder)
         layout.addWidget(self.table)
 
         self.status = QLabel("")
         layout.addWidget(self.status)
 
+    def _save_icon(self, folder):
+        """Return a small QIcon from a save folder's ICON0.PNG, or None."""
+        if not folder:
+            return None
+        p = Path(folder) / "ICON0.PNG"
+        if not p.is_file():
+            return None
+        pm = QPixmap(str(p))
+        if pm.isNull():
+            return None
+        return QIcon(_fit_pixmap(pm, 40, 32))
+
     def set_locations(self, psp_dir, ppsspp_dir, cloud_dir):
         self._psp_dir = psp_dir or ""
         self._ppsspp_dir = ppsspp_dir or ""
@@ -3406,6 +3419,7 @@ class SavesPage(QWidget):
             self.table.insertRow(row)
             title = sid
             enc = False
+            icon = None
             for loc in ("psp", "ppsspp", "cloud"):
                 s = data[loc].get(sid)
                 if s is None:
@@ -3414,10 +3428,14 @@ class SavesPage(QWidget):
                     title = s["title"]
                 if s.get("encrypted"):
                     enc = True
+                if icon is None:
+                    icon = self._save_icon(s.get("path"))
             if enc:
                 title += "  \u26a0"
             t = QTableWidgetItem(title)
             t.setToolTip(sid)
+            if icon is not None:
+                t.setIcon(icon)
             self.table.setItem(row, 0, t)
             self.table.setItem(row, 1, QTableWidgetItem(sid))
             for col, loc in enumerate(("psp", "ppsspp", "cloud"), start=2):