[Bleeding] Correct issues with MEGA_REDWOOD trees. Fixes BUKKIT-5568

In commit 6efeddfe57, TALL_REDWOOD was used instead of the proper TreeType
of MEGA_REDWOOD. Additionally, this fixes an issue in CraftWorld with an
improper boolean flag related to the generation of MEGA_REDWOOD trees.
[Bleeding] Allow generation of cocoa trees.
[Bleeding] Include equipment in EntityDeathEvent loot. Fixes BUKKIT-5566
[Bleeding] Recheck persistence for chicken jockeys each tick. Fixes BUKKIT-5577