Merge branch 'integration_merge' of https://github.com/mavlink/qgroundcontrol into restyling

Conflicts:
	src/uas/ArduPilotMegaMAV.h
	src/ui/uas/UASListWidget.cc
Fixed null pointer issue
Fixed issue when custom message set is enabled
Fixed HUD / Video widget to be useful
Merge
Merge
Merge branch 'integration_merge_connstatus' of github.com:Susurrus/qgroundcontrol into integration_merge_connstatus
Minor changes
Fixed styling of the toolbar, specifically coloring and sizing of the buttons, and made the labels aware of the current window theme. Also made some changes to updating the toolbar when switching UASes or when UASes disconnect/reconnect.