APC code cleanup

- Span and formatting absolutely everywhere
- Unfuck some strings, add more flavor
- More visible_message, stop them from being cast on user
- Remove useless src typcecasting
- Capitalize comment and remove one blankspace to improve readibility
- Remove old commented code (outside of the debug node)

There shouldn't have been any functional changes beyond the next, this is purely to clean up the APC code :

- Remove prob(20) when trying to break the cover off a broken APC, especially since it yields no message
Well, it is the case for some reason. 6 ticks is about 600 milliseconds (0.6 s) though so unless you are mashing your keyboard you should succeed