Easier 3D LUTs

I got some feedback from the boss about creating 3D LUTs, as described earlier: "too many steps". So I wrote a script to help out, and in a burst of imagination I called it "Create3DLUT". Thanks to the magic of automation, you can now create your 3D LUTs more easily:

• Set up a chain of colour correction tools on the flow.
• Select them all, and run the Create3DLUT script from the comp's Scripts menu.