rebase to v0.15.0-b6 + removed unused code

Author: softhack007

CONTRIBUTING.md

@@ -27,9 +27,11 @@ Github will pick up the changes so your PR stays up-to-date.
 > For example, we regularly lost review comments when the PR author force-pushes code changes. So, pretty please, do not force-push.
 
 
+
 You can find a collection of very useful tips and tricks here: https://github.com/Aircoookie/WLED/wiki/How-to-properly-submit-a-PR
 
 
+
 ### Code style
 
 When in doubt, it is easiest to replicate the code style you find in the files you want to edit :)