hector_quadrotor_model: added boolean return value for configure() methods
hector_quadrotor_gazebo_plugins: aerodynamics plugin should apply forces and torques in world frame
hector_quadrotor_model/hector_quadrotor_gazebo_plugins: fixed configuration namespace and plugin cleanup
hector_quadrotor_model: output drag forces in body coordinate system and added orientation input

This commit partially reverts 9b5e85f2248cf139c3a1c336348ca29ed70fb093.
hector_quadrotor_gazebo_plugins: disabled separate queue thread for the aerodynamics plugin