Tidied up Clamp.h includes.
Tidied up Clamp.h includes.

GafferHQ/gaffer,johnhaddon/gaffer,chippey/gaffer,cedriclaunay/gaffer,goddardl/gaffer,davidsminor/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,cedriclaunay/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,goddardl/gaffer,ImageEngine/gaffer,boberfly/gaffer,hradec/gaffer,ImageEngine/gaffer,cedriclaunay/gaffer,chippey/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,boberfly/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,chippey/gaffer,appleseedhq/gaffer,hradec/gaffer,davidsminor/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,cedriclaunay/gaffer,GafferHQ/gaffer,chippey/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,hradec/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,hradec/gaffer,andrewkaufman/gaffer,davidsminor/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,ivanimanishi/gaffer,boberfly/gaffer,boberfly/gaffer,hradec/gaffer,johnhaddon/gaffer,goddardl/gaffer,johnhaddon/gaffer,goddardl/gaffer