vlib/net: add buffered IO, x.net -> net (#6754)

examples/buf_reader.v

@@ -0,0 +1,21 @@
+// Simple raw HTTP head request
+import net
+import time
+import io
+
+// Make a new connection
+mut conn := net.dial_tcp('google.com:80')?
+// Simple http HEAD request for a file
+conn.write_str('GET /index.html HTTP/1.0\r\n\r\n')?
+// Make sure to set a timeout so we can wait for a response!
+conn.set_read_timeout(10 * time.second)
+// Wrap in a buffered reader
+mut r := io.new_buffered_reader(reader: io.make_reader(conn))
+for {
+	l := r.read_line() or {
+		break
+	}
+	println('$l')
+	// Make it nice and obvious that we are doing this line by line
+	time.sleep_ms(10)
+}