[CLEAN] Added missing includes in headers

Source/Engine/Content/Loading/ContentLoadTask.h

@@ -3,6 +3,7 @@
 #pragma once
 
 #include "Engine/Threading/Task.h"
+#include "Engine/Core/Types/String.h"
 
 class Asset;
 class LoadingThread;

Source/Engine/Content/Upgraders/ModelAssetUpgrader.h

@@ -8,6 +8,7 @@
 #include "Engine/Serialization/MemoryReadStream.h"
 #include "Engine/Serialization/MemoryWriteStream.h"
 #include "Engine/Graphics/Models/ModelData.h"
+#include "Engine/Content/Asset.h"
 
 /// <summary>
 /// Model Asset Upgrader

Source/Engine/Content/Upgraders/ShaderAssetUpgrader.h

@@ -4,6 +4,7 @@
 
 #include "BinaryAssetUpgrader.h"
 #include "Engine/Platform/Platform.h"
+#include "Engine/Graphics/Shaders/Cache/ShaderStorage.h"
 
 /// <summary>
 /// Material Asset and Shader Asset Upgrader

Source/Engine/Content/Upgraders/SkinnedModelAssetUpgrader.h

@@ -6,6 +6,11 @@
 #include "Engine/Platform/Platform.h"
 #include "Engine/Serialization/MemoryReadStream.h"
 #include "Engine/Serialization/MemoryWriteStream.h"
+#include "Engine/Graphics/Models/Types.h"
+#include "Engine/Core/Math/BoundingBox.h"
+#include "Engine/Core/Math/BoundingSphere.h"
+#include "Engine/Core/Math/Matrix.h"
+#include "Engine/Core/Math/Transform.h"
 
 /// <summary>
 /// Skinned Model Asset Upgrader