Extract module for common bodice methods

Both front and back bodice pieces need to know how to draw same side seam
Move dart truing method to bodice module

Knowing how to true a dart is going to be something all pieces need to know how to do
Extract Bodice Front class
Extract bodice back class
Inline back and front bodice methods

Now that I've got classes for these, I don't need these methods as much
Rename front bodice start point