#48 Show Duration levels accomplished

[Leon Baradat]

Currently the Satellite Building shows the Duration Level, a variable the game uses to keep track of the highest duration level accomplished by the player. It would be more informative, though, if it showed each Duration level accomplished so you could see at a glance if you skipped one. So for instance, if you've accomplished A, B, D, and E but skipped C, instead of DUR LVL: NONE it could show something like DUR: A B D E