Change arm/disarm mavlink message usage
Change arm/disarm mavlink message usage

This was done to support both PX4 and APM flight stack with same code

scott-eddy/qgroundcontrol,catch-twenty-two/qgroundcontrol,Hunter522/qgroundcontrol,CornerOfSkyline/qgroundcontrol,ethz-asl/qgc_asl,cfelipesouza/qgroundcontrol,CornerOfSkyline/qgroundcontrol,cfelipesouza/qgroundcontrol,ethz-asl/qgc_asl,scott-eddy/qgroundcontrol,RedoXyde/PX4_qGCS,mihadyuk/qgroundcontrol,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,mihadyuk/qgroundcontrol,ethz-asl/qgc_asl,CornerOfSkyline/qgroundcontrol,dagoodma/qgroundcontrol,CornerOfSkyline/qgroundcontrol,remspoor/qgroundcontrol,RedoXyde/PX4_qGCS,kd0aij/qgroundcontrol,Hunter522/qgroundcontrol,catch-twenty-two/qgroundcontrol,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,RedoXyde/PX4_qGCS,CornerOfSkyline/qgroundcontrol,CornerOfSkyline/qgroundcontrol,mihadyuk/qgroundcontrol,Hunter522/qgroundcontrol,scott-eddy/qgroundcontrol,RedoXyde/PX4_qGCS,ethz-asl/qgc_asl,remspoor/qgroundcontrol,RedoXyde/PX4_qGCS,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,mihadyuk/qgroundcontrol,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,catch-twenty-two/qgroundcontrol,cfelipesouza/qgroundcontrol,scott-eddy/qgroundcontrol,ethz-asl/qgc_asl,remspoor/qgroundcontrol,catch-twenty-two/qgroundcontrol,dagoodma/qgroundcontrol,remspoor/qgroundcontrol,dagoodma/qgroundcontrol,Hunter522/qgroundcontrol,mihadyuk/qgroundcontrol,remspoor/qgroundcontrol,scott-eddy/qgroundcontrol,dagoodma/qgroundcontrol,cfelipesouza/qgroundcontrol,kd0aij/qgroundcontrol,kd0aij/qgroundcontrol,dagoodma/qgroundcontrol,cfelipesouza/qgroundcontrol,scott-eddy/qgroundcontrol,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,kd0aij/qgroundcontrol,dagoodma/qgroundcontrol