Makes Exosuit Charging station fully buildable.

Adds the Power port design and circuit.
Changes recharge_station from a turf to a machine with 0 density and Crossed procs. This is also now buildable with a circuit and a design.
Fixes some relative pathing.
The odd thing is, the code already exists for actively manipulating these frame descriptions when you add components. I'll see what I can do about adapting it in another PR.