Remove dependency on Robotics System Toolbox

[ybeyer]

The EasyGlider/init_EasyGlider_Trajectory example only works with Robotics System Toolbox. However, the functions used should also all be included in LADAC (e.g. rotm2quat -> dcm2Quat).

[ybeyer]

@fguecker says: Although both functions (transposed) numerically return the same result, the example with the LADAC function dcm2Quat does not work. The cause is unknown.