Add multipart machines system (#35969)

Content.Shared/ParticleAccelerator/AcceleratorParts.cs

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+using Robust.Shared.Serialization;
+
+namespace Content.Shared.ParticleAccelerator;
+
+[Serializable, NetSerializable]
+public enum AcceleratorParts : byte
+{
+    EndCap,
+    FuelChamber,
+    PowerBox,
+    PortEmitter,
+    ForeEmitter,
+    StarboardEmitter
+};
+
+

Content.Shared/ParticleAccelerator/Components/ParticleAcceleratorEmitterComponent.cs

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+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.ParticleAccelerator.Components;
+
+[RegisterComponent]
+public sealed partial class ParticleAcceleratorEmitterComponent : Component
+{
+    [DataField]
+    public EntProtoId EmittedPrototype = "ParticlesProjectile";
+
+    [DataField("emitterType")]
+    [ViewVariables(VVAccess.ReadWrite)]
+    public ParticleAcceleratorEmitterType Type = ParticleAcceleratorEmitterType.Fore;
+
+    public override string ToString()
+    {
+        return base.ToString() + $" EmitterType:{Type}";
+    }
+}
+
+public enum ParticleAcceleratorEmitterType
+{
+    Port,
+    Fore,
+    Starboard
+}

Content.Shared/ParticleAccelerator/Components/ParticleAcceleratorEndCapComponent.cs

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+namespace Content.Shared.ParticleAccelerator.Components;
+
+[RegisterComponent]
+public sealed partial class ParticleAcceleratorEndCapComponent : Component
+{
+}

Content.Shared/ParticleAccelerator/Components/ParticleAcceleratorFuelChamberComponent.cs

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+namespace Content.Shared.ParticleAccelerator.Components;
+
+[RegisterComponent]
+public sealed partial class ParticleAcceleratorFuelChamberComponent : Component
+{
+}

Content.Shared/ParticleAccelerator/Components/ParticleAcceleratorPowerBoxComponent.cs

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+namespace Content.Shared.ParticleAccelerator.Components;
+
+[RegisterComponent]
+public sealed partial class ParticleAcceleratorPowerBoxComponent : Component
+{
+}