Add support for custom Hopper inventories. Fixes BUKKIT-4722

Opening a hopper inventory created by Server.createInventory will
currently have no effect as proper handling code is missing in
CraftEntityHuman for hopper inventories that aren't associated with a tile
entity or minecart. Initialization logic for hoppers is also missing from
CraftContainer, which is necessary for the opening of custom hopper
inventories.

This commit fixes the two aforementioned by adding proper handling to
CraftHumanEntity for opening inventories not associated with a tile
entity, and by adding initialization logic for hoppers to CraftContainer.
Provide a tab completion handler for JLine. Adds BUKKIT-4168
Remove unnecessary error logging. Fixes BUKKIT-4406
Use correct spawn reason for Zombie reinforcements. Fixes BUKKIT-4744
Add missing villager sounds. Addresses BUKKIT-4756
Fix villager death sound
Update for 1.6.2_01 renames.
Updated version to 1.6.2-R1.0 in pom.xml for RB.
Updated version to 1.6.2-R1.1-SNAPSHOT for development towards next release.