Movement: Implement afterburners

[assofohdz]

Afterburner makes the ship go faster, but depletes health. Get settings for how much health is depleted through the Settings state. The afterburner effect can possibly be a debuff applied to the player while afterburner is in effect, then maybe the EnergySystem will automatically reduce health on the player.

From Wikipedia:

Players achieve their ship's top speed by maintaining thrust. Each ship is also equipped with afterburners (Shift+Up/Down) which allow the ship to exceed its typical top speed; however, this gradually drains the ship's energy. When afterburners are disengaged, the ship's inertia returns to its normal top speed, not its speed with afterburners.