When parsing StructuredDataDefs accept undefined types

src/ObjLoading/StructuredDataDef/Parsing/StructuredDataDefParserState.cpp

@@ -2,11 +2,20 @@
 
 using namespace sdd;
 
+UndefinedType::UndefinedType()
+= default;
+
+UndefinedType::UndefinedType(std::string name, const TokenPos firstUsagePos)
+    : m_name(std::move(name)),
+      m_first_usage_pos(firstUsagePos)
+{
+}
+
 StructuredDataDefParserState::StructuredDataDefParserState()
     : m_current_def(nullptr),
       m_current_enum(nullptr),
       m_current_struct(nullptr),
-      m_current_struct_offset_in_bits(0u),
+      m_current_struct_padding_offset(0u),
       m_checksum_override_value(0u),
       m_checksum_overriden(false)
 {