add Cavity components in a new method for ALIGOFactory

This adds a new method add_Cavities to ALIGOFactory which adds the arm, PRC, and SRC Cavity components and removes where those cavities are added in add_arm_cavity, add_PRC, and add_SRC. It is added to make so that everything makes the same way by default.

This reduces the amount of method overloading needed by deranged lunatics running around subclassing factories willy nilly.