This updates my old era styles modcomp to 3.19. Essentially each unit can have a different appearance in each era. As provided, tags are repeated to simulate unmodded civ, ie most units have just one appearance; workers, workboats, and most great people change appearance in the industrial; and great generals have distinct looks in the first two eras, the middle two and the last three. This time I actually put all the 7 tags into all the default units so all you have to do is retype the art define.