Control Surface changes.

Change PYR from On/Off to -100%~100% coefficients.
Add a pitch due to AoA coefficient for Slats/Canards.
Adjust deflection angles to be symmetrical and bigger.
Add k2 for Pitch Damper

This coefficient is used for pitch damper working when player is still
pulling stick.
Change stepIncrement to 5.
Merge pull request #29 from HoneyFox/master

Control surface changes & Pitch damper changes.