Add resizeable panels

[amareshsm]

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What is the purpose of this pull request?

Added resizable split-view to the resize editor and preview panel.

What changes did you make? (Give an overview)

Related Issues

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[nzakas]

I'm not sure we need this. As soon as you add resizable panels, you also need a way to reset to the default. I'm not sure it's worth the effort.