TaskControl rqt plugin

Receives available tasks message and sends one of them via button press
TaskControl now using task_msgs/TaskActivationAction interface
Button layout and shutdown improvements
TaskControl updates button color on task status
Fix dict iteration runtime error

Switch from print to rospy.logxxx
Fix goal canceling
Move files into subdirectory to merge that into other repository
Merge branch 'master' of local repo ../rqt_task_control
Fix license and others tags in rqt_task_control package
Commit package task_msgs