BackgroundTask : Remove unused imports
BackgroundTask : Remove unused imports

andrewkaufman/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,hradec/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,boberfly/gaffer,hradec/gaffer,johnhaddon/gaffer,boberfly/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,hradec/gaffer,andrewkaufman/gaffer,hradec/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,boberfly/gaffer,boberfly/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,hradec/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,ImageEngine/gaffer