Added files for the flying agent GUI, currently compiles in Qt but need significantly testing and development for integrating with ROS

Added a mutex to the RF status label, and adjust the clearing and updating of the bettery status label, seems to be working without too many freezes... will always require more testing

Adjusted battery level image in Student GUI to onlz re-draw when image changes. Tested and seems to be stable.

Adjusted GUI so that all display boxes are checked, and so that the scaling is applied to a CF when it is added (push_back) into the crazyflies_vector

Started on making the Parameter Service more generic, compiled and tested, still needs full implementaiton