More Simpler Platform Drag

Makes platform drag force linearly proportional to speed and average width-height instead of width-only quadratic drag.

This makes the top speed of space platforms with full thrusters depend on the width-to-height ratio instead of maintaining a nearly constant ~500 km/s.

Further details

old formula

(thrust / (1 + weight / 10000000) - ((1500 * speed * speed + 1500 * abs(speed)) * (width * 0.5) + 10000) * sign(speed)) / weight / 60

new formula

(thrust / (1 + weight / 10000000) - (3000 * abs(speed) * (width + height) + 10000)) * sign(speed) / weight / 60

Credits

The implement of this mod was inspired by Rocs-Improved-Platform-Drag