Don't let Term::ANSIColor polute our namespace

This was leading to the cryptic error message:

ERROR: Invalid attribute name genome::model::build::command::view=hash(0x6cf8ba8) at /gscuser/dmorton/deployments/bases_for_sample/genome/ur/lib/UR/Object.pm line 192

when an attribute named 'color' was inherited and not redefined in the derived class.