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Command module builder

After enjoying success with custom scripts to automate the creation of object and widget modules, I thought that I'd do the same for building new new Gnocl commands. Here there is no widget registration and so on but the familiar framework of commands, sub-commands and options needs to be there.
Again, so far so good. The first practical use of this will be to create a gnocl::pixMap command to handle off-screen rendering of images.
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