Add arc to cart plugin

Summary: Adds arc to the cart plugin

Test Plan: if you see this it probably worked!

Reviewers: #everyone

Maniphest Tasks: T1507

Differential Revision: https://dev.blendtec.com/D954

Conflicts:
	.arclint
Add arc to cart plugin

Summary: Adds arc to the cart plugin

Test Plan: if you see this it probably worked!

Reviewers: #everyone

Maniphest Tasks: T1507

Differential Revision: https://dev.blendtec.com/D954