New sig for Gretchen.EXE

First process upgrade nets her a new sig, which meets the dual goals of healing and giving me more wood elemental things to do.

Amber Assault: A small, digital mosquito is thrown in the direction of Gretchen's target. After draining some of the target's life force, the data bug (Pun intended) returns to give Gretchen the spoils. The target will find itself quite itchy later in the day.

20 Wood Life Drain, Thrown Attack (1TCD) [Cost 40 pts]