VTOL_architecture

Added VTOL_att_control module which is still in the testing phase so don't expect anything to work!
fw_att_controller and mc_att_contoller now publish on virtual topics if airframe is of type VTOL. 
Added rc.vtol_apps and rc.vtol_defaults.

TODO: In rcS the MAV_TYPE variable for the VTOL case was so to 0 which means generic. There should exist a MAV_TYPE for VTOL!

Hi, the HIL is a mistake, it shouldn't be there, the mistake was ported from the fw_att_control module.
Yes, we are in fact working on a simulation for a vtol which used PX4 modules. We are planning to use JSBSim and embedd the entire thing in a ROS environment.