Move response string twice instead of copying
Move response string twice instead of copying

bkircher/ews-cpp,bkircher/ews-cpp,otris/ews-cpp,m-Schlitzer/ews-cpp,m-Schlitzer/ews-cpp,otris/ews-cpp,bkircher/ews-cpp,otris/ews-cpp,otris/ews-cpp,m-Schlitzer/ews-cpp