Add support for packed clients (#802)

* First iteration of pack reader and interface

* Fix memory leak and remove logs

* Complete packed asset interface and begin on file loading replacement

* Implement proper BinaryIO error

* Improve AssetMemoryBuffer for reading and implement more reading

* Repair more file loading code and improve how navmeshes are loaded

* Missing checks implementation

* Revert addition of Manifest class and migration changes

* Resolved all feedback.

dCommon/dClient/PackIndex.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <cstdint>
+
+#include <string>
+#include <vector>
+#include <filesystem>
+
+#include "Pack.h"
+
+#pragma pack(push, 1)
+struct PackFileIndex {
+	uint32_t m_Crc;
+	int32_t m_LowerCrc;
+	int32_t m_UpperCrc;
+	uint32_t m_PackFileIndex;
+	uint32_t m_IsCompressed; // u32 bool?
+};
+#pragma pack(pop)
+
+class PackIndex {
+public:
+	PackIndex(const std::filesystem::path& filePath);
+	~PackIndex();
+
+	const std::vector<std::string>& GetPackPaths() { return m_PackPaths; }
+	const std::vector<PackFileIndex>& GetPackFileIndices() { return m_PackFileIndices; }
+	const std::vector<Pack*>& GetPacks() { return m_Packs; }
+private:
+	std::ifstream m_FileStream;
+
+	uint32_t m_Version;
+
+	uint32_t m_PackPathCount;
+	std::vector<std::string> m_PackPaths;
+	uint32_t m_PackFileIndexCount;
+	std::vector<PackFileIndex> m_PackFileIndices;
+
+	std::vector<Pack*> m_Packs;
+};