Trading Outpost now has half buy-only and half sell-only pallets (#25955)

* Added new Buy & Sell specific cargo pallets

* Remapped trading outpost with new pallets, tweaked texture

* Removed debug message

* Fixed/Compacted conditional checking to let old pallets still work for backwards compatability

* Update Content.Server/Cargo/Components/CargoPalletComponent.cs

Alright, updating all the references to it.

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

* Changed textures, changed to enum instead of string for pallet type check

* Few minor code tweaks/formatting fixes

* Missed the prototype change

* Update Content.Server/Cargo/Components/CargoPalletComponent.cs

* Update Content.Server/Cargo/Systems/CargoSystem.Shuttle.cs

---------

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Cargo/Components/CargoPalletComponent.cs

@@ -1,7 +1,26 @@
 namespace Content.Server.Cargo.Components;
+using Content.Shared.Actions;
+using Robust.Shared.Serialization.TypeSerializers.Implementations;
 
 /// <summary>
 /// Any entities intersecting when a shuttle is recalled will be sold.
 /// </summary>
+
+[Flags]
+public enum BuySellType : byte
+{
+    Buy = 1 << 0,
+    Sell = 1 << 1,
+    All = Buy | Sell
+}
+
+
 [RegisterComponent]
-public sealed partial class CargoPalletComponent : Component {}
+public sealed partial class CargoPalletComponent : Component
+{
+    /// <summary>
+    /// Whether the pad is a buy pad, a sell pad, or all.
+    /// </summary>
+    [DataField]
+    public BuySellType PalletType;
+}