feat: parse hitboxes (correctly this time x2)

src/sourcepp/detail/BufferUtils.cpp

@@ -4,6 +4,11 @@
 
 void sourcepp::detail::readStringAtOffset(BufferStream& stream, std::string& str, std::ios::seekdir offsetFrom, std::size_t subtractFromOffset) {
 	int offset = stream.read<int>();
+	if (offset == 0) {
+		str = "";
+		return;
+	}
+
 	auto pos = stream.tell();
 	stream.seek(offset - subtractFromOffset, offsetFrom);
 	stream.read(str);

src/studiomodelpp/structs/MDL.cpp

@@ -123,7 +123,11 @@ bool MDL::open(const std::byte* data, std::size_t size) {
 			stream.read(hitbox.group);
 			stream.read(hitbox.bboxMin);
 			stream.read(hitbox.bboxMax);
-			readStringAtOffset(stream, hitbox.name, std::ios::cur, sizeof(int) * 4 + sizeof(Vector3) * 2);
+
+			// note: we don't know what model versions use absolute vs. relative offsets here
+			//       and this is unimportant, so skip parsing the bbox name here
+			//readStringAtOffset(stream, hitbox.name, std::ios::cur, sizeof(int) * 3 + sizeof(Vector3) * 2);
+			hitbox.name = "";
 
 			// _unused0
 			stream.skip<int>(8);