- removed all warnings
Merge branch 'core-ui-separation' of git://github.com/jukea/drone into tats/gstreamer-experimental-merge-jukea

Conflicts:
	src/core/DroneCore.cpp
	src/core/Utils.h
	src/core/composite/CompositeGeneric.cpp
	src/drone/GearTreeView.cpp
	src/drone/SchemaGui.cpp
	src/drone/SchemaGui.h
	src/gears/ShaderTest/Gear_ShaderTest.h
	src/gears/VideoOutput/VideoOutputGl.cpp
	src/gears/VideoSource/Gear_VideoSource.cpp
Removed draggear.xpm
Cosmetic change
Removed useless SETTING_FILENAME