ItemBaseColor now uses the new ItemHelper#get/setShieldColor.
ItemBaseColor now uses autoRegisterNullable, to allow removing a base color.
Additions
ItemHelper#get/setShieldColor - for controlling a shield item's base color.
[!NOTE]
Decided to just go with NMS, as Spigot's API for this is pretty broken currently - can always go back to the API if/when Spigot fixes it, but would be nice to bump the API version already
Changes
ItemBaseColornow uses the newItemHelper#get/setShieldColor.ItemBaseColornow usesautoRegisterNullable, to allow removing a base color.Additions
ItemHelper#get/setShieldColor- for controlling a shield item's base color.