Vox tweaks/fixes, dionaea changes.

[X] Emag now has limited uses.
[X] Diona should feed off radiation.
[X] Longer cooldown on Vox shuttle movement.
[X] Vox shuttle shutters.
[ ] Larger, cycling Vox airlocks.
[X] Vox webbing, additional arrows.
[X] Replace C4 with plasma cutter.
[X] Spawn fancy hat for Quill.
[X] Remove all-access from main shuttle airlocks.
[X] Add baubles for trading.
[X] Stealth drive toggle to replace Atmospheric alert computer (announces trader ship approaching).