Giáp ngực Kerfur tiêu chuẩn cho Dummy 13

Wanted to make a version of the chest armor for the standard Dummy 13 frame, plus added a version where the center camera piece is separate to easily print in a different color.

A new inner chest part is also included to better fit the profile of the new chest armor. Standard inner chest has its bottom most angles popping out awkwardly as seen on the green armor Kerfur.