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>

Resources/Textures/Structures/cargo_pallets.rsi/meta.json

@@ -0,0 +1,17 @@
+{
+    "version": 1,
+    "license": "CC-BY-SA-3.0",
+    "copyright": "Created by TheShuEd (github) for Space Station 14)",
+    "size": {
+        "x": 32,
+        "y": 32
+    },
+    "states": [
+        {
+            "name": "cargo_pallet_buy"
+        },
+        {
+            "name": "cargo_pallet_sell"
+        }
+    ]
+}