Update flatc to version 1.7.0
Update flatc to version 1.7.0

Congee/scoop,reelsense/scoop,toxeus/scoop,lukesampson/scoop,vidarkongsli/scoop,yunspace/scoop,berwyn/scoop,rasa/scoop,kodybrown/scoop,nikolasd/scoop,coonce/scoop,Cyianor/scoop