X-cell Pill 0.2.2

1 new pill (X-cell) sold in the pharmacy. 
It is a stat-improvement pill for X-Change Life with conditional duration based on meeting total improvement goals.
It targets one of three stats (Intellect, Charm, or Fitness) for development. The pill lasts **1+ days** based on meeting the required total improvement goal before expiration. 
In order to aid you to excel in improving yourself, you will gain bonus XP (configurable) in the target stat, while you are on the pill. If you don't meet the target improvement threshold by expiration time, the duration automatically extends by one day.
The trade-off is that taking Xcell comes with a challenging side effect and temporary craving to balance the benefits.
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Mechanics:

Duration & Goals
- **Base duration**: 1 day
- **Goal calculation**: `ceiling((10 - currentStatValue) / 3)`
  - Example: If Intellect is 8, goal = ceiling((10-8)/3) = ceiling(0.67) = 1 point total improvement needed before expiration
  - Example: If Charm is 5, goal = ceiling((10-5)/3) = ceiling(1.67) = 2 points total improvement needed before expiration
- **Total improvement check**: When the pill expires, it checks if you've met the improvement threshold
  - **Goal met**: Pill expires normally that evening
  - **Goal NOT met**: Duration extends 1 more day automatically

Target Stat (Random)
When you take Xcell, one of these is randomly selected:
- **Intellect** - Improve your intelligence and quick thinking
- **Charm** - Improve your social and persuasive abilities
- **Fitness** - Improve your physical strength and endurance

Side Effects (Random Combination)
The pill applies **two temporary side effects** for added challenge:
1. **Stat-decreasing debuff** (one of 9 combinations):
   - Swallow decreases [Intellect/Charm/Fitness]
   - Creampies decrease [Intellect/Charm/Fitness]
   - Orgasms decrease [Intellect/Charm/Fitness]
2. **Temporary craving** (matches the side effect):
   - **Swallow craving**: Urge to swallow during orgasm (NEW)
   - **Creampie craving**: Urge to get creampied during orgasm (existing)
   - **Orgasm craving**: Enhanced orgasm pleasure (via increased pleasure side effect)

Cravings
Swallow Craving (NEW)
- Mirrors the existing "Creampie Craving" mechanic
- When active during orgasm, player can opt to set `$his_choice` to "mouth"
- Triggers swallowing during sexual encounters
- Temporary (expires when pill expires)
Creampie Craving
- Already exists in the base game
- When active during orgasm, player can beg for creampie instead
- Triggers get-creampied status during sexual encounters
Orgasm Craving
- Heightened pleasure leading to orgasms
- Enhances orgasm satisfaction and tracking