v1.11 - GUI Legacy Compatability

Changes:

• Added compatability changes for legacy (<1.16) MC versions. Should now support down to 1.8 again.
• Added a new section to the GUI config for displaying when hex colours are not available (if you're using <1.16). I would advise deleting gui.yml and allowing the plugin to generate a new one with the added section, or you can manually add the section like so (to each GUI with colours):

hex-colors-not-supported:
lore:
- '&cHex colors are only supported on 1.16+.'
material: BARRIER

• As such, any hex colours in GUIs in legacy versions will not be usable, but will display as such. Any display names with hex colours in will be displayed as white.
• Side note: updated plugin to v1.11 (major update, should have done with the GUI update itself).

Let me know if there's anything else that needs fixing, I'm around for a few more hours