Added new Special Tasks:

Find a strong signal for the ER, Geiger, AIR or Temperature Tools. Grants 15 points/funds when completed but has no penalty if not. These new Tasks should help to get players started with the Tools.

Bugfixes:

• Fix in staircase lighting.

Polishes:

• Oxygen alert now sounds at < 25% instead of < 10%,
• Integrity alert now sounds at < 25% instead of < 10%,
• Slightly increased oxygen and integrity alert rate,