Hopper rewrite

[RVSkeLe]

Complete rewrite of the hopper feature:

• Added runChunkTask to the Scheduler to avoid using Location every time, to avoid its overhead
• Properly keep track of "spawner hoppers" to avoid sync chunk loads and performance issues
• Simplified HopperTransfer#transferItems logic
• Cached hopper config values in HopperConfig

Note: I already tried this version on a test server and I think everything is okay, but since this was a big rewrite, I might have missed something