Collapsable pages (Backend) Created andy-man & Carlos edit by multicolor

Plugin Description:

Adds collapse/expand-functionality to page-list script by andy-man / plugin created by Carlos / added animation (good color for light-theme) by multicolor

This is not my plugin! But i dont find this on repo, so i upload this. Many people search them, me too.

What i add? Small feature: animation + / - icon color inverse for good view in light theme created by me.