Backlight abstraction and other changes (#439)

* redoes matrix pins, abstracts backlight code for B5,6,7

* slimming down keyboard stuff, backlight breathing implemented

* don't call backlight init when no pin

* cleans up user/kb/quantum calls, keyboard files

* fix pvc atomic

* replaces CHANNEL with correct var in breathing

* removes .hexs, updates readmes, updates template

* cleans-up clueboards, readmes to lowercase

* updates readme

quantum/template/template.h

@@ -1,13 +1,7 @@
 #ifndef %KEYBOARD_UPPERCASE%_H
 #define %KEYBOARD_UPPERCASE%_H
 
-#include "matrix.h"
-#include "keymap.h"
-#ifdef BACKLIGHT_ENABLE
-	#include "backlight.h"
-#endif
-#include <avr/io.h>
-#include <stddef.h>
+#include "quantum.h"
 
 // This a shortcut to help you visually see your layout.
 // The following is an example using the Planck MIT layout
@@ -22,9 +16,4 @@
     { k10, KC_NO, k11 }, \
 }
 
-void matrix_init_user(void);
-void matrix_scan_user(void);
-bool process_action_user(keyrecord_t *record);
-void led_set_user(uint8_t usb_led);
-
 #endif