v1.10.5 - Customisable GUI & 1.17 Support

Changes:

• Added an all-new customisable GUI!
  • You can define you own GUIs to contain as many colours as you want.
  • Hex colours are supported, simply use #RRGGBB format as the 'data' entry for any item in the GUI (see example hex colours gui).
  • Default GUIs are in gui.yml, please follow the format described in the config for creating your own ones!
  • color-unavailable, modifier-unavailable, color-active, color-inactive, modifier-active, modifier-inactive are all optional (you only need these for GUIs that have colours/modifiers in them respectively). If they are missing where needed, a default version will be used for any missing items.
  • Important: You cannot use the same material for color-unavailable and anything else - this will cause anything using that material to behave like an unavailable colour. Try and use different materials for everything, if you can.
    
• Updated the plugin to work with MC 1.17 (there was a small bug causing incompatability).

As always, if there are any bugs, please let me know! I will be away for around 2 weeks but will fix anything when I return.