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/shared.py.in

@@ -0,0 +1,74 @@
+# shared.py.in
+#
+# Copyright 2022-2023 kramo
+#
+# 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 os
+from enum import IntEnum, auto
+from pathlib import Path
+
+from gi.repository import Gdk, Gio, GLib
+
+
+class AppState(IntEnum):
+    DEFAULT = auto()
+    LOAD_FROM_DISK = auto()
+    IMPORT = auto()
+    REMOVE_ALL_GAMES = auto()
+    UNDO_REMOVE_ALL_GAMES = auto()
+
+
+APP_ID = "@APP_ID@"
+VERSION = "@VERSION@"
+PREFIX = "@PREFIX@"
+PROFILE = "@PROFILE@"
+SPEC_VERSION = 1.5  # The version of the game_id.json spec
+
+schema = Gio.Settings.new(APP_ID)
+state_schema = Gio.Settings.new(APP_ID + ".State")
+
+home = Path.home()
+data_dir = Path(GLib.get_user_data_dir())
+config_dir = Path(GLib.get_user_config_dir())
+cache_dir = Path(GLib.get_user_cache_dir())
+flatpak_dir = home / ".var" / "app"
+
+games_dir = data_dir / "cartridges" / "games"
+covers_dir = data_dir / "cartridges" / "covers"
+
+appdata_dir = Path(os.getenv("appdata") or "C:\\Users\\Default\\AppData\\Roaming")
+local_appdata_dir = Path(
+    os.getenv("csidl_local_appdata") or "C:\\Users\\Default\\AppData\\Local"
+)
+programfiles32_dir = Path(os.getenv("programfiles(x86)") or "C:\\Program Files (x86)")
+
+try:
+    scale_factor = max(
+        monitor.get_scale_factor()
+        for monitor in Gdk.Display.get_default().get_monitors()
+    )
+except AttributeError:  # If shared.py is imported by the search provider
+    pass
+else:
+    image_size = (200 * scale_factor, 300 * scale_factor)
+
+# pylint: disable=invalid-name
+win = None
+importer = None
+import_time = None
+store = None
+log_files = None