The Flatpacker 1001 can now make flatpacks for computers. (#23471)

* moved ComputerBoardComponent to Content.Shared

* made flatpacker accept computer boards

* made flatpack system and ui function with computer boards

* fixed it so that flatpacks of computers are correctly coloured to fit their computer board colour

* unhardcoded the computer flatpack assembly cost

* Combined GetFlatpackCreationCost(...) with GetflatpackCreationCostForComputer(...)

* removed code duplication in SharedFlatpackSystem

* removed code duplication from FlatpackCreatorMenu.xaml.cs

* remove code duplication from FlatpackSystem (on the server)

* fixed indentation error

Content.Shared/Construction/Components/ComputerBoardComponent.cs

@@ -0,0 +1,15 @@
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Construction.Components
+{
+    /// <summary>
+    /// Used for construction graphs in building computers.
+    /// </summary>
+    [RegisterComponent]
+    public sealed partial class ComputerBoardComponent : Component
+    {
+        [DataField("prototype", customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
+        public string? Prototype { get; private set; }
+    }
+}