Zsh Plumber: Prototype 2

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The second prototype is done, but buggy.

I’ve changed a few things: Most notably, this no longer overrides accept-line. Instead, this uses ZLE hooks to modify the buffer right before it is executed. Whether the $BUFFER will still be used in the end is TBD.

This now writes to a temporary pipe, which is handled by:

	cat >$FILE &
	zselect -r $CTRL_FD
	kill $pid
	cat >$OUT_FD
) <&$IN_FD &

I’m having a hard time getting both the initial (pre-pipe) process and the zselect-based-switcher to die when the final process terminates, though.