More sensible feeding penalties for vampires

[ProbablyManuel]

Feeding reduces the victim's health by 125 for 3 days, which is enough to outright kill the Vampire Cattle in Castle Volkihar and some Vampire Thralls in dungeons. Furthermore, there are three apparent bugs with the feeding penalties:

1. The script is set up to allow up to two per feedings per victim, but due to the condition setup the second feeding can never apply.
2. The penalties (and therefore the feeding cooldown) last 3 real time days, which corresponds to 30 in-game days with the default timescale.
3. The penalties (and therefore the feeding cooldown) are dispelled when the player leaves the victim's cell.

Expected Outcome

• Feeding reduces the victim's health by 80 for 3 in-game days, regardless of whether the player leaves the victim's cell.
• Feeding can be repeated any number of times until the victim dies.