replaced two area shield gens with hull shield gens in engineering storage

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
tweaked a couple of supply packs, added a supply pack for hull shield gen circuitboard

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
minor tweaks and cleanups to shield gens/caps, modified some setting limits for shield gens/caps

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>