Add IW4 asset loader classes for all asset types that did not have one yet

src/ObjLoading/Game/IW4/AssetLoaders/AssetLoaderPixelShader.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "Game/IW4/IW4.h"
+#include "AssetLoading/BasicAssetLoader.h"
+#include "SearchPath/ISearchPath.h"
+
+namespace IW4
+{
+    class AssetLoaderPixelShader final : public BasicAssetLoader<ASSET_TYPE_PIXELSHADER, MaterialPixelShader>
+    {
+    public:
+        _NODISCARD void* CreateEmptyAsset(const std::string& assetName, MemoryManager* memory) override;
+    };
+}