Spigot patch 0044: InventoryClickEvent now can return if the click was a double click. Fixes Bukkit-4035.

https://github.com/EcoCityCraft/Spigot/blob/7db53a4407d49fd69c30ee29ad68499a6fac51b0/CraftBukkit-Patches/0044-InventoryClickEvent-now-can-return-if-the-click-was-.patch