Fix code pattern in WeMegaMenuBuilder.php

Both MRs now have conflicts. It's unclear from the thread which MR is correct to merge anyway.

I will work on it.

Hi I did the rebase, but still has a lot of phpcs errors.

MR !3 was focused in WeMegaMenuBuilder.php, but had a lot of rebases that afected other files.
MR !17 also focus on WeMegaMenuBuilder.php, without the bunch of files from rebase.

Neither has the WeMegaMenuBuilder.php clear for coding standards, so I keep it in needs work.

I did my best with descriptions and params documentation, please let me know anything I can make better.
needs review