Patch 0.2.1 - Tutorialized Tool Signal Tasks and some small things

[h3][b]Added new Special Tasks:[/b][/h3] 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. [h3][b]Bugfixes:[/b][/h3] [list] [*] Fix in staircase lighting. [/list][h3][b]Polishes:[/b][/h3] [list] [*] 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, [/list]