Refactor staryu to current standards and enable support for backlight keycodes (#5487)

keyboards/staryu/backlight_staryu.h

@@ -1,12 +1,21 @@
-#ifndef STARYU_BL
-#define STARYU_BL
+/*
+Copyright 2019
 
-#include <stdint.h>
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
 
-void init_backlight_led(void);
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
 
-void backlight_led_on(uint8_t index);
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
 
-void backlight_led_off(uint8_t index);
-
-#endif
+// Add backwards compatibility for existing keymaps
+#define backlight_led_off(i) backlight_set_value(i, 0)
+#define backlight_led_on(i) backlight_set_value(i, 1)