Refactor stations to properly use entity prototypes. (stationsv3) (#16570)

* Update StationSpawningSystem.cs

Web-edit to allow feeding in an existing entity.

* Update StationSpawningSystem.cs

value type moment

* Update StationSpawningSystem.cs

* Oh goddamnit this is a refactor now.

* awawawa

* aaaaaaaaaaa

* ee

* forgot records.

* no records? no records.

* What's in a name?

* Sloth forcing me to do the refactor properly smh.

* e

* optional evac in test.

* tests pls work

* awa

---------

Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>

Content.Server/Shuttles/Components/StationEmergencyShuttleComponent.cs

@@ -0,0 +1,24 @@
+using Content.Server.Shuttles.Systems;
+using Robust.Shared.Serialization.TypeSerializers.Implementations;
+using Robust.Shared.Utility;
+
+namespace Content.Server.Shuttles.Components;
+
+/// <summary>
+/// This is used for controlling evacuation for a station.
+/// </summary>
+[RegisterComponent]
+public sealed class StationEmergencyShuttleComponent : Component
+{
+    /// <summary>
+    /// The emergency shuttle assigned to this station.
+    /// </summary>
+    [ViewVariables, Access(typeof(ShuttleSystem), typeof(EmergencyShuttleSystem), Friend = AccessPermissions.ReadWrite)]
+    public EntityUid? EmergencyShuttle;
+
+    /// <summary>
+    /// Emergency shuttle map path for this station.
+    /// </summary>
+    [DataField("emergencyShuttlePath", customTypeSerializer: typeof(ResPathSerializer))]
+    public ResPath EmergencyShuttlePath { get; set; } = new("/Maps/Shuttles/emergency.yml");
+}