Initial commit for Kaine's custom items.
replaced two bubble shield gens in engineering storage with hull shield gens leaving one bubble shield gen

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
Merge pull request #4831 from SueTheCake/customitem

Kaine Kalim/Kocoa's custom items.
Merge pull request #4838 from caelaislinn/shields_mapchange

Engineering storage tweak