static void setThemeManager(ThemeManager manager) {
		themeManager = manager;
	}
Returns true if the given id is a system-defined id, such as those starting with
{@code laf.color} or {@code system.color}.

@param id the id
@return true if the given id is a system-defined id
Ghidra/Framework/Gui/src/main/java/generic/theme/Gui.java