Implement search provider (#201)

* Begin work on search provider

* Initial search provider work, organize meson

* Initial work on icons

* Implement LaunchSearch

* Don't hold arbitrary reference to service

I don't know why Lollypop does this

* Send notification, pad images

* Update translations

* Fix init_search_term typing

cartridges/store/managers/file_manager.py

@@ -0,0 +1,59 @@
+# file_manager.py
+#
+# Copyright 2023 Geoffrey Coulaud
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import json
+
+from cartridges import shared
+from cartridges.game import Game
+from cartridges.store.managers.async_manager import AsyncManager
+from cartridges.store.managers.steam_api_manager import SteamAPIManager
+
+
+class FileManager(AsyncManager):
+    """Manager in charge of saving a game to a file"""
+
+    run_after = (SteamAPIManager,)
+    signals = {"save-ready"}
+
+    def main(self, game: Game, additional_data: dict) -> None:
+        if additional_data.get("skip_save"):  # Skip saving when loading games from disk
+            return
+
+        shared.games_dir.mkdir(parents=True, exist_ok=True)
+
+        attrs = (
+            "added",
+            "executable",
+            "game_id",
+            "source",
+            "hidden",
+            "last_played",
+            "name",
+            "developer",
+            "removed",
+            "blacklisted",
+            "version",
+        )
+
+        json.dump(
+            {attr: getattr(game, attr) for attr in attrs if attr},
+            (shared.games_dir / f"{game.game_id}.json").open("w"),
+            indent=4,
+            sort_keys=True,
+        )