[install] Added backup option prompt and use mv instead of rm -rf
[install] Added backup option prompt and use mv instead of rm -rf

DePierre/owtf,DarKnight--/owtf,DarKnight--/owtf,sharad1126/owtf,sharad1126/owtf,owtf/owtf,DarKnight24/owtf,DePierre/owtf,DarKnight--/owtf,DarKnight--/owtf,owtf/owtf,owtf/owtf,DarKnight24/owtf,DarKnight24/owtf,owtf/owtf,DePierre/owtf,owtf/owtf,sharad1126/owtf,sharad1126/owtf,DarKnight24/owtf,DePierre/owtf