Uses/adapts new active mutation system: grants the ability to sprint and shout.

Renames 'mutations' menu to 'abilities and mutations' menu.
Gives all starting characters a pair of free traits that allow them to sprint and shout.
Shouting just makes noise. It's a weaker version of the extant shouting mutation power.
Sprinting reduces movement cost, burns fatigue, thirst, and hunger. When you sprint for a while you eventually become winded and stop being able to run until you rest, this is based off of your strength attribute.