ENH: oscillatingLinearMotion: add optional phase- and vertical-shift entries

The governing equation of oscillatingLinearMotion for the displacement was changed to with Function1 input entries:

y = A\, sin(B (t + C)) + D

where:

        y    | Displacement [m] (vector)
        A    | Amplitude [m] (vector)
        B    | Radial velocity [rad/s] (scalar)
        C    | Phase-shift to left [s] (scalar)
        D    | Vertical shift [m] (vector)

EP1925