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/ergodox_ez/ergodox_ez.h

@@ -119,9 +119,4 @@ inline void ergodox_led_all_set(uint8_t n)
     { k0D, k1D, k2D, k3D, k4D, KC_NO }    \
    }
 
-void matrix_init_user(void);
-void matrix_scan_user(void);
-
-
-
 #endif