public static FlatLaf createLaf( InputStream in )
		throws IOException
	{
		return createLaf( new IntelliJTheme( in ) );
	}
Loads a IntelliJ .theme.json file from the given input stream and
creates a Laf instance for it.

The input stream is automatically closed.
Using a buffered input stream is not necessary.
flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java