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/cluepad/cluepad.c

@@ -1,21 +1,9 @@
 #include "cluepad.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
-    if (matrix_init_user) {
-        (*matrix_init_user)();
-    }
+    matrix_init_user();
 
     #ifdef BACKLIGHT_ENABLE
         init_backlight_pin();
@@ -25,11 +13,3 @@ void matrix_init_kb(void) {
     MCUCR |= (1<<JTD);
     MCUCR |= (1<<JTD);
 };
-
-void matrix_scan_kb(void) {
-	// put your looping keyboard code here
-	// runs every cycle (a lot)
-	if (matrix_scan_user) {
-		(*matrix_scan_user)();
-	}
-};

keyboards/cluepad/cluepad.h

@@ -35,7 +35,4 @@
     { k40, KC_NO, k42, KC_NO } \
 }
 
-void matrix_init_user(void);
-void matrix_scan_user(void);
-
 #endif