Fix being able to spam eat and spam drink items

Because Assistants have nothing to do in their day but ruining the Chef or Bartender's day by emptying ten minutes of work down the hatch by abusing a shortcut loophole around attack_self delays

• Fix being able to eat food and down drinks at lighting speed. Slow the fuck down and stop emptying the Bar and the Kitchen every single round

Uses the same thing as the bike horn. It's pretty hardcoded (add a delay on fire, spawn() to remove delay), but reworking the entire delay system for a small issue like this might be too much