Another handful of kilobytes that make Learning Factory better:
- Zeppelins' highlight transparency decreased while they are in mid-air
- Zeppelin shadows transparency decreases while Zeppelins are high from the ground
- Decreased size of all Zeppelins (suggested by Milarky)
- 1 new hidden achievement
- Lots of bug fixes (kudos to Milarky, S'Kleer)