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/StringUtil.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "copium/util/Common.h"
+
+#include <string>
+#include <string_view>
+
+namespace Copium
+{
+
+  class StringUtil
+  {
+    CP_STATIC_CLASS(StringUtil);
+
+  public:
+    static std::string_view Trim(const std::string& str);
+    static std::string_view Trim(const std::string_view& str);
+  private:
+    static size_t GetTrimStartPos(const std::string_view& str);
+    static size_t GetTrimEndPos(const std::string_view& str);
+  };
+}