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/keymaps/algernon/.gitignore

@@ -1 +0,0 @@
-/compiled.hex

keyboards/ergodox_ez/keymaps/algernon/keymap.c

@@ -1,5 +1,5 @@
 /*
- * algernon's ErgoDox EZ layout, please see the README.md file!
+ * algernon's ErgoDox EZ layout, please see the readme.md file!
  */
 
 #include "ergodox_ez.h"