Suppress some useless methods in the pancake worlds ( raw & burned )
Little improving of when "flipped" changes is value
Add method isSorted in PacnakeWorld ( this method was already used in the entity, I just le the user knows about it )
Sort the method according to their name
Add the lesson panel and the shortcuts made by Marion LEBRAS and which hadn't been implemented yet ( see: https://github.com/marionlb/JLM/ )