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/Pack.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <filesystem>
+
+#pragma pack(push, 1)
+struct PackRecord {
+	uint32_t m_Crc;
+	int32_t m_LowerCrc;
+	int32_t m_UpperCrc;
+	uint32_t m_UncompressedSize;
+	char m_UncompressedHash[32];
+	uint32_t m_Padding1;
+	uint32_t m_CompressedSize;
+	char m_CompressedHash[32];
+	uint32_t m_Padding2;
+	uint32_t m_FilePointer;
+	uint32_t m_IsCompressed; // u32 bool
+};
+#pragma pack(pop)
+
+class Pack {
+public:
+	Pack(const std::filesystem::path& filePath);
+	~Pack() = default;
+
+	bool HasFile(uint32_t crc);
+	bool ReadFileFromPack(uint32_t crc, char** data, uint32_t* len);
+private:
+	std::ifstream m_FileStream;
+	std::filesystem::path m_FilePath;
+
+	char m_Version[7];
+
+	uint32_t m_RecordCount;
+	std::vector<PackRecord> m_Records;
+};