AdvancedKits v1.22.7

✦ Changes:
● Updated all libraries to the latest version.
● Added %advancedkits_kit_is_upgradeable_<kit>% PlaceholderAPI placeholder.
● Removed the {upgradeable} placeholder from the kit placeholders.
● Optimized the menu fillers and the preview menus.​

✦ Changes:
● Updated all libraries to the latest version.
● Added a username on the player heads with a texture.
● Optimized the custom UUID on the player heads with a texture.
● Preparing for a new system to create unlimited menus.​

✦ Changes:
● Updated all libraries to the latest version.
● Optimized the method of injecting placeholders on the kit items.
● Added the ability to use custom model data on all display items.
● Fixed a typo on the plugin description.​

✦ Changes:
● Added all features from the SpigotMC version.​

✦ Changes:
● Fixed the kit preview information item.​

✦ Changes:
● Fixed an issue when creating a kit via coding.​

✦ Changes:
● Added powerful API for developers.​

✦ Changes:
● Added ability for developers to create custom kits.​