v1.0.0

• improved close license session when GAMSModelInstance is freed
• updated modify GAMSDatabaseImpl::getSymbolByIndex to keep it in sync with recent GMD change (gmdGetSymbolByIndex expects 1-based symbol index)

This version of the GAMS C++ API requires GAMS 48 or any newer GAMS version that gets released before there is a new release of the GAMS C++ API. To download GAMS, please visit https://www.gams.com/latest/. To learn more about the GAMS C++ API, please visit https://www.gams.com/latest/docs/API_CPP_OVERVIEW.html