Add Asset system

- Add Abstract Asset class which defines Assets
- Add AssetManager class to keep track of all the Asset
- Add AssetFile class to cache the asset without loading it
- Add UUID class to uniquely identify assets
- Add MetaFile class to load meta asset files

CopiumEngine/src/copium/util/UUID.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <stdint.h>
+#include <iostream>
+#include <random>
+
+namespace Copium
+{
+  class UUID
+  {
+  private:
+    uint64_t msb;
+    uint64_t lsb;
+    static std::random_device randomDevice;
+    static std::mt19937 randomGenerator;
+    static std::uniform_int_distribution<uint64_t> randomDistribution;
+  public:
+    UUID();
+    UUID(uint64_t msb, uint64_t lsb);
+    // Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+    UUID(const std::string& uuidString);
+
+    std::string ToString() const;
+
+    bool operator==(const UUID& rhs);
+    bool operator!=(const UUID& rhs);
+    bool operator<(const UUID& rhs);
+
+    friend std::ostream& operator<<(std::ostream& os, const UUID& uuid);
+
+  private:
+    uint8_t HexToDec(char c) const;
+    char DecToHex(uint8_t byte) const;
+  };
+}