private void updatePreviewLabel(Icon icon) {
			previewLabel.setIcon(icon);
			int height = icon.getIconHeight();
			int width = icon.getIconWidth();
			Dimension d = previewLabel.getSize();
			height = Math.max(d.height, height);
			width = Math.max(d.width, width);
			previewLabel.setPreferredSize(new Dimension(width, height));
			previewLabel.invalidate();
			iconChooserPanel.validate();
		}
Returns all icons loaded by core Ghidra modules. For this use, we only want to use
icons that are part of a standard distribution because if they are exported, they may
not be available on import. Non-core icons can be used by picking them from the file
system.
@Return all icons loaded by core Ghidra modules
Ghidra/Framework/Docking/src/main/java/docking/options/editor/IconPropertyEditor.java