public static void setSystemColorGetter( Function<String, Color> systemColorGetter ) {
		FlatLaf.systemColorGetter = systemColorGetter;
	}
Sets a system color getter function that is invoked when function
{@code systemColor()} is used in FlatLaf properties files.
<p>
The name of the system color is passed as parameter to the function.
The function should return {@code null} for unknown system colors.
<p>
Can be used to change the accent color:
<pre>{@code
FlatLaf.setSystemColorGetter( name -> {
    return name.equals( "accent" ) ? Color.red : null;
} );
FlatLightLaf.setup();
}</pre>

@since 3
flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java