Use @Parameter callbacks for GUI interactivity

[mdoube]

Legacy plugins used GenericDialog and DialogListener from AWT to achieve GUI interactivity when an option was dependent on another option's state. In IJ2, this is achieved with callback = someMethod which updates the fields based on the method's logic. AnisotropyWrapper uses it, like this:

See also the use of the validater = someValidationMethod @Parameter option to run a check on the input Dataset prior to running the Command.

	@Parameter(label = "Lines per direction",
		description = "How many lines are sampled per direction",
		min = "1", style = NumberWidget.SPINNER_STYLE, required = false,
		callback = "applyMinimum")
	private Integer lines = DEFAULT_LINES;

	@Parameter(label = "Recommended minimums",
		description = "Apply minimum recommended values to directions, lines, and increment",
		persist = false, required = false, callback = "applyMinimum")
	private boolean recommendedMin;

	@SuppressWarnings("unused")
	private void applyMinimum() {
		if (recommendedMin) {
			lines = DEFAULT_LINES;
			directions = DEFAULT_DIRECTIONS;
			samplingIncrement = minIncrement;
		}
	}