Multi-map and multi-station gameticker loading (#6167)

Content.Server/Station/Components/BecomesStationComponent.cs

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+using Content.Server.GameTicking;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Station;
+
+/// <summary>
+///     Added to grids saved in maps to designate that they are the 'main station' grid.
+/// </summary>
+[RegisterComponent, ComponentProtoName("BecomesStation")]
+[Friend(typeof(GameTicker))]
+public class BecomesStationComponent : Component
+{
+    /// <summary>
+    ///     Mapping only. Should use StationIds in all other
+    ///     scenarios.
+    /// </summary>
+    [DataField("id", required: true)]
+    public string Id = default!;
+}

Content.Server/Station/Components/PartOfStationComponent.cs

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+using Content.Server.GameTicking;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Station;
+
+/// <summary>
+///     Added to grids saved in maps to designate them as 'part of a station' and not main grids. I.e. ancillary
+///     shuttles for multi-grid stations.
+/// </summary>
+[RegisterComponent, ComponentProtoName("PartOfStation")]
+[Friend(typeof(GameTicker))]
+public class PartOfStationComponent : Component
+{
+    [DataField("id", required: true)] // does yamllinter even lint maps for required fields?
+    public string Id = default!;
+}

Content.Server/Station/Components/StationComponent.cs

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+using Content.Shared.Station;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Station;
+
+[RegisterComponent, Friend(typeof(StationSystem))]
+public class StationComponent : Component
+{
+    public override string Name => "Station";
+
+    public StationId Station = StationId.Invalid;
+}