v1.2.4

finished clean new UI
make upgrades configuration-based so anyone can add/change them
attempted to do the same for exotics, requires a mod to make a hullmod
add iron shell upgrade

hotfix: include ironshell.png and fix missing string
hotfix 2: update mod info.json to 1.2.0 and fix a crash if you modified vanilla files to recover tesseracts for some reason
hotfix 3: removed a java 8-only method
hotfix 4: fix upgrade method button broke
hotfix 5: fix crash because of crew salary increase stat
hotfix 6: fix UI scaling