LARGEST_REGION = calculate the centroid of the target based on the largest region. This is useful for targets with stacked regions like a bullseye.
BOUNDING_BOX = calculate the centroid of the target based on the bounding box for all regions. This is useful for targets where regions are not stacked, such as the 5 small bullseyes target.
Training protocol passes in a target name and gets back the coords of the target's centroid.
Use case talked about here: https://github.com/phrack/ShootOFF/pull/46#issuecomment-29207016
This should offer two modes:
LARGEST_REGION should be the default.