Read before updating:

We have changed some stuff with the gui system:
- The decorations sections will NOT work anymore, you can now add decorative items simply by defining a new item the same way as the default items, you will have to change this when updating or they will not show up.
- The guis will now parse PlaceholderAPI placeholders if you have it installed.
- You can now use the %current_page% and %max_page% placeholders in multi page guis' title.
- Added a 'page-size' setting to multi page menus, which used to be calculated manually, but now you can set it.