public static void copy(InputStream in, Writer writer) throws IOException {
		copy(in, writer, StandardCharsets.UTF_8, newCharBuffer());
	}
Transfers content of {@link InputStream} into {@link Writer}.
Uses {@link StandardCharsets#UTF_8} as default charset.

@param in
		Stream to transfer content from.
@param writer
		Writer to transfer content to.

@throws IOException
		When any I/O error occurs.
@see IOUtil#newCharBuffer()
recaf-core/src/main/java/software/coley/recaf/util/IOUtil.java