Fixes #6609, supplements #6610

Haphazardly adds a cell charger and normal recharger to the vox skipjack, along with an extra screwdriver.
Vox armor siemens coefficient made to match Syndicate armor, at 0.8 rather than 0.6.

I will note that ERT armor has a coefficient of 0.6 as suggested in #6609. Should I perhaps change both Vox/Syndicate to match or up ERT to 0.8?