Fixed wrong initiation of CONV_HISTORY and other globals that led to UndefVarError. Moved several globals to const Ref{} pattern to ensure type stability, but it means that from now it always needs to be dereferenced with [] (eg, MAIN_INDEX[] instead of MAIN_INDEX).
CONV_HISTORYand other globals that led to UndefVarError. Moved several globals toconst Ref{}pattern to ensure type stability, but it means that from now it always needs to be dereferenced with[](eg,MAIN_INDEX[]instead ofMAIN_INDEX).