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

keyboards/phantom/phantom.c

@@ -1,25 +1,9 @@
 #include "phantom.h"
 #include "led.h"
 
-__attribute__ ((weak))
-void matrix_init_user(void) {
-	// leave these blank
-};
-
-__attribute__ ((weak))
-void matrix_scan_user(void) {
-	// leave these blank
-};
-
 void matrix_init_kb(void) {
 	// put your keyboard start-up code here
 	// runs once when the firmware starts up
 	matrix_init_user();
 	led_init_ports();
 };
-
-void matrix_scan_kb(void) {
-	// put your looping keyboard code here
-	// runs every cycle (a lot)
-	matrix_scan_user();
-};

keyboards/phantom/phantom.h

@@ -1,10 +1,7 @@
 #ifndef PHANTOM_H
 #define PHANTOM_H
 
-#include "matrix.h"
-#include "keymap.h"
-#include <stddef.h>
-#include "action_util.h"
+#include "quantum.h"
 
 /* Phantom matrix layout
    * ,-----------------------------------------------------------------------------.
@@ -40,7 +37,4 @@
 		{k50, k51, k52, k57, k57, k57, k57, k57, k57, k57, k5a, k5b, k5c, k5d, k5e, k5f, k5g} \
 }
 
-void matrix_init_user(void);
-void matrix_scan_user(void);
-
 #endif