Added launchfile to launch gazebo iris and mavros bridge. Added sitl_gazebo to makefile and new init rc file for gazebo iris apps and params

Validate parameter meta data

Moved ADC channel defines for battery voltage, battery current, and a…

Moved ADC channel defines for battery voltage, battery current, and airspeed voltage to board_config.h. This allows better portabilit of code from one board to another, since it removes the hardcoded #ifdef sections from the Px4 sensors code.

Updated HIL documentation

Moved ADC channel definitions to the board_config.h file. This way ne…

Model name from ROS parameter server instead of hardcoded string

PX4 package depends on mav_msgs

Rc cleanup

Ros multiplatform in posix

It already uses it in the cmakelists, but was missing a dependency in
the package.xml.