Fix CVar saves + add fork-specific CVars - #6667

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4.2.2, actions/setup-dotnet@v4.1.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'RandomHelpers.NextByte(Random, byte)' is obsolete: 'Always use RobustRandom/IRobustRandom, System.Random does not provide any extra functionality.'

'IMapManager.GetAllGrids(MapId)' is obsolete: 'Use MapSystem'

'Component.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'IMapManager.TryFindGridAt(MapId, Vector2, out EntityUid, out MapGridComponent?)' is obsolete: 'Use MapSystem'

'ComponentTreeSystem<TTreeComp, TComp>.QueryAabb(HashSet<ComponentTreeEntry<TComp>>, MapId, Box2Rotated, bool)' is obsolete: 'Use Entity<T> variant'

'IMapManager.FindGridsIntersecting<TState>(MapId, Box2, ref TState, GridCallback<TState>, bool, bool)' is obsolete: 'Use MapSystem'

'IMapManagerInternal' is obsolete

'IMapManagerInternal' is obsolete

'IMapManagerInternal' is obsolete

'IMapManagerInternal' is obsolete

Field 'cef_settings_t_posix.user_agent_product' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.multi_threaded_message_loop' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.chrome_policy_id' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.remote_debugging_port' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.no_sandbox' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.framework_dir_path' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.external_message_pump' is never assigned to, and will always have its default value 0

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XML comment has badly formed XML -- 'A string literal was expected, but no opening quotation mark was found.'

Field 'cef_settings_t_posix.log_severity' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.framework_dir_path' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.chrome_app_icon_id' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.log_items' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.root_cache_path' is never assigned to, and will always have its default value

Field 'cef_settings_t_posix.external_message_pump' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.remote_debugging_port' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.command_line_args_disabled' is never assigned to, and will always have its default value 0

Field 'cef_settings_t_posix.accept_language_list' is never assigned to, and will always have its default value