MainWindow: make PFD the central widget.
MainWindow: make PFD the central widget.

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

Hunter522/qgroundcontrol,remspoor/qgroundcontrol,kd0aij/qgroundcontrol,josephlewis42/UDenverQGC2,CornerOfSkyline/qgroundcontrol,scott-eddy/qgroundcontrol,catch-twenty-two/qgroundcontrol,devbharat/qgroundcontrol,cfelipesouza/qgroundcontrol,fizzaly/qgroundcontrol,ethz-asl/qgc_asl,iidioter/qgroundcontrol,catch-twenty-two/qgroundcontrol,mihadyuk/qgroundcontrol,UAVenture/qgroundcontrol,BMP-TECH/qgroundcontrol,kd0aij/qgroundcontrol,cfelipesouza/qgroundcontrol,iidioter/qgroundcontrol,CornerOfSkyline/qgroundcontrol,josephlewis42/UDenverQGC2,CornerOfSkyline/qgroundcontrol,devbharat/qgroundcontrol,caoxiongkun/qgroundcontrol,LIKAIMO/qgroundcontrol,LIKAIMO/qgroundcontrol,RedoXyde/PX4_qGCS,iidioter/qgroundcontrol,remspoor/qgroundcontrol,LIKAIMO/qgroundcontrol,nado1688/qgroundcontrol,hejunbok/qgroundcontrol,devbharat/qgroundcontrol,jy723/qgroundcontrol,RedoXyde/PX4_qGCS,mihadyuk/qgroundcontrol,greenoaktree/qgroundcontrol,dagoodma/qgroundcontrol,CornerOfSkyline/qgroundcontrol,kd0aij/qgroundcontrol,jy723/qgroundcontrol,fizzaly/qgroundcontrol,cfelipesouza/qgroundcontrol,BMP-TECH/qgroundcontrol,TheIronBorn/qgroundcontrol,ethz-asl/qgc_asl,remspoor/qgroundcontrol,cfelipesouza/qgroundcontrol,LIKAIMO/qgroundcontrol,dagoodma/qgroundcontrol,kd0aij/qgroundcontrol,josephlewis42/UDenverQGC2,remspoor/qgroundcontrol,devbharat/qgroundcontrol,UAVenture/qgroundcontrol,catch-twenty-two/qgroundcontrol,Hunter522/qgroundcontrol,remspoor/qgroundcontrol,LIKAIMO/qgroundcontrol,hejunbok/qgroundcontrol,greenoaktree/qgroundcontrol,caoxiongkun/qgroundcontrol,lis-epfl/qgroundcontrol,jy723/qgroundcontrol,TheIronBorn/qgroundcontrol,LIKAIMO/qgroundcontrol,hejunbok/qgroundcontrol,lis-epfl/qgroundcontrol,caoxiongkun/qgroundcontrol,hejunbok/qgroundcontrol,nado1688/qgroundcontrol,hejunbok/qgroundcontrol,greenoaktree/qgroundcontrol,nado1688/qgroundcontrol,BMP-TECH/qgroundcontrol,kd0aij/qgroundcontrol,BMP-TECH/qgroundcontrol,nado1688/qgroundcontrol,greenoaktree/qgroundcontrol,scott-eddy/qgroundcontrol,mihadyuk/qgroundcontrol,ethz-asl/qgc_asl,Hunter522/qgroundcontrol,UAVenture/qgroundcontrol,TheIronBorn/qgroundcontrol,lis-epfl/qgroundcontrol,fizzaly/qgroundcontrol,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,caoxiongkun/qgroundcontrol,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,iidioter/qgroundcontrol,TheIronBorn/qgroundcontrol,ethz-asl/qgc_asl,scott-eddy/qgroundcontrol,UAVenture/qgroundcontrol,BMP-TECH/qgroundcontrol,devbharat/qgroundcontrol,lis-epfl/qgroundcontrol,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,CornerOfSkyline/qgroundcontrol,nado1688/qgroundcontrol,RedoXyde/PX4_qGCS,fizzaly/qgroundcontrol,TheIronBorn/qgroundcontrol,catch-twenty-two/qgroundcontrol,catch-twenty-two/qgroundcontrol,RedoXyde/PX4_qGCS,ethz-asl/qgc_asl,CornerOfSkyline/qgroundcontrol,jy723/qgroundcontrol,greenoaktree/qgroundcontrol,UAVenture/qgroundcontrol,Hunter522/qgroundcontrol,josephlewis42/UDenverQGC2,devbharat/qgroundcontrol,lis-epfl/qgroundcontrol,mihadyuk/qgroundcontrol,Hunter522/qgroundcontrol,remspoor/qgroundcontrol,TheIronBorn/qgroundcontrol,scott-eddy/qgroundcontrol,caoxiongkun/qgroundcontrol,jy723/qgroundcontrol,jy723/qgroundcontrol,scott-eddy/qgroundcontrol,kd0aij/qgroundcontrol,iidioter/qgroundcontrol,greenoaktree/qgroundcontrol,catch-twenty-two/qgroundcontrol,scott-eddy/qgroundcontrol,dagoodma/qgroundcontrol,cfelipesouza/qgroundcontrol,iidioter/qgroundcontrol,RedoXyde/PX4_qGCS,mihadyuk/qgroundcontrol,hejunbok/qgroundcontrol,dagoodma/qgroundcontrol,nado1688/qgroundcontrol,UAVenture/qgroundcontrol,Hunter522/qgroundcontrol,caoxiongkun/qgroundcontrol,cfelipesouza/qgroundcontrol,BMP-TECH/qgroundcontrol