Bug 48773 [Preferences] Workbench should use ColorRegistry for color management.
Wherever possible, the workbench should use the new Color API for its colors.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceConverter.java
* Returns the default value for the color-valued preference
	 * with the given name in the given preference store.
	 * Returns the default-default value (<code>COLOR_DEFAULT_DEFAULT</code>) 
	 * is no default preference with the given name, or if the default 
	 * value cannot be treated as a color.
	 *
	 * @param store the preference store
	 * @param name the name of the preference
	 * @return the default value of the preference
	 */
	public static RGB getDefaultColor(IPreferenceStore store, String name) {
		return basicGetColor(store.getDefaultString(name));
	}
	/**
	 * Returns the default value array for the font-valued preference
	 * with the given name in the given preference store.
	 * Returns the default-default value (<code>FONTDATA_ARRAY_DEFAULT_DEFAULT</code>) 
	 * is no default preference with the given name, or if the default 
	 * value cannot be treated as font data.
	 *
	 * @param store the preference store
	 * @param name the name of the preference
	 * @return the default value of the preference
	 */
	public static FontData[] getDefaultFontDataArray(
		IPreferenceStore store,
		String name) {
		return basicGetFontData(store.getDefaultString(name));
	}
	/**