Hey buddy. I wanted to tell you this before you heard it from someone
else...
I refactored ICG.
Now, it's gonna look a little scary at first. But I promise you'll like
it when you get used to it. It'll be fine. You can trust me. #341
Removed the requirement of passing flags throughout ICG indicating if we are
in an inherited class or not. Removed the init_attr friends throughout
Trick core headers.
