Implement warp drives

[aggregate1166877]

Details:
Implement warp drives.

Requirements:

• We need warp drives types that can accelerate either linearly or exponentially. Note that, regardless of type, max speed should be the same for both.
• We need to take into account gravity; essentially, gravity introduces spacetime drag. Spacetime drag reduces warp drive max speed.
• Create a scaling mechanism where increasing engine output power causes explosive increase in speed. For example, a 206 engine might have a max speed of 3c (3x speed of light), while a 209 engine would have a max speed of 4c.
• Physics should be disabled while in warp. There is no reverse, and no moving vertically.