Build failure: missing include

Currently building from source fails due to a missing include in `SplitCode.h`
```
  SplitCode.h:540:44: Fehler: »int32_t« ist kein Element von »std«; meinten Sie »int32_t«?
  540 |     int POS_MAX = std::numeric_limits<std::int32_t>::max();
```
This failure occurs when compiling with GCC 13.3.0