Remove dependency on EditorScriptingUtilities plugin in the metadata-textures branch #803
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This is a PR into #698. The reason Travis CI fails in that branch is because our dodgy cut down distribution of Unreal Engine doesn't include a bunch of plugins, including EditorScriptingUtilities. But it's relatively easy to remove the dependency in this case, so that's what I've done.
I also removed the code that saves the generated material. I think it's fine to let the Editor consider it unsaved, and to let the user save in the normal way if they would like to do so. But maybe there's a more subtle reason it was necessary to save it explicitly? Everything seemed to work ok, but it's possible I missed something.