Update to clipboard-modifier

Of my tools that I've written, the one I use most often is clipboard-modifier. I have it on my panel so that it's only one click away.
I had longtime desire to make this tool more flexible, before I would have to always modify the code in order to have it do something different. Now each plugin can add wxPython widgets on the dialog, thus they can control their own state and parameters.
Perhaps the most useful is the ability to send the clipbard (via stdin) to any program and then update the clipboard from the program's output. A good example is sorting the clipboard. Another is filtering it through grep, say.

The program still needs more polish, but it's already very useful, for me.

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