ENH: functionObject: refactored co-ordinate system usage and new forceCoeffs members

• If applied: This commit on top of the current forceCoeffs allows the user to compute:

  • Side force coefficient whose direction in curl(lift,drag),
  • Yaw moment coefficient whose rotation axis in dir(lift),
  • Roll moment coefficient whose rotation axis in dir(drag)
  • Also, for developers:
    • Destructor is = default
    • Some divisions were replaced by multiplications
    • Some repetitive multiplications were reduced to a single oper
    • Name change: momentCoeff -> pitchMomentCoeff
    • Order of output is reorganised as moments(pitch,yaw,roll) and forces(lift,drag,side)
    • For force coefs, the front and rear axles' contributions are computed

• Verification: Passed sanity checks and valgrind-memcheck

• What's next:

  • Update for the Extended code guide entry

• Related:

  • Designated pitch, yaw, roll orientation can be seen in: en.wikipedia.org/wiki/Yaw_(rotation)#/media/File:Flight_dynamics_with_text.png