public static boolean setup( InputStream in ) {
		try {
		    return FlatLaf.setup( createLaf( in ) );
		} catch( Exception ex ) {
			LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to load IntelliJ theme", ex );
		    return false;
		}
	}
Loads a IntelliJ .theme.json file from the given input stream,
creates a Laf instance for it and sets it up.

The input stream is automatically closed.
Using a buffered input stream is not necessary.

@since 1.2
flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java