C++: Add il2cppi_is_initialized() API to scaffolding

Il2CppInspector.Common/Properties/Resources.resx

@@ -207,6 +207,8 @@ std::string il2cppi_to_string(app::String* str) {
 #include <sstream>
 #include <iomanip>
 
+#include "il2cpp-metadata-version.h"
+
 // Helper function to get the module base address
 uintptr_t il2cppi_get_base_address();
 
@@ -222,6 +224,16 @@ std::string il2cppi_to_string(Il2CppString* str);
 // Helper function to convert System.String to std::string
 std::string il2cppi_to_string(app::String* str);
 
+// Helper function to check if a metadata usage pointer is initialized
+template<typename T> bool il2cppi_is_initialized(T* metadataItem) {
+#if __IL2CPP_METADATA_VERISON < 270
+    return *metadataItem != 0;
+#else
+    // Metadata >=27 (Unity 2020.2)
+    return !((uintptr_t) *metadataItem & 1);
+#endif
+}
+
 // Helper function to convert a pointer to hex
 template<typename T> std::string to_hex_string(T i) {
     std::stringstream stream;