Semi-ports /tg/'s cyborg inventory HUD.

See https://github.com/Baystation12/Baystation12/pull/7079


Cyborgs (and drones) get a new button on their HUD, which opens a pseudo-inventory, filled with their module items. Clicking on the item will equip it to a module slot. Storing it will put it back. This is intended to replace the old module item select system.

Emagged items show up as expected. Depleting a resource (metal, etc) causes it to disappear. Recharging makes it show up again as normal).

The old module system remains, as I couldn't decide if I should remove it or not.

Picture:
http://puu.sh/cYer2/204f9fedf1.png

This is my first bay PR, so let me know if I messed up somewhere.