Two More Little Fixes

1. Fixes turbine computers disappearing when broken/out of power (due to a lack of icons). I left the old icons in for the different screen states, even though they aren't used anywhere.

2. Adds an ex_act to ore boxes. Fixes explosions deleting all the ore in the box.
Yeah, everity 1 is the most damaging explosion and 3 is lowest, ~legacy~