v0.6.0

More interactions (pumpkin carving, waterlogging, pig saddling), each implemented and bot-verified against a live server.

Added

• Pumpkin carving — right-clicking an uncarved pumpkin with shears turns it into a carved pumpkin and drops pumpkin
  seeds. Verified (mcbot_pumpkin.py): a placed pumpkin becomes a carved pumpkin on shear use and drops a seed item.
• Waterlogging — a water bucket on a waterloggable block (slab, stairs, fence, …) fills it with water (WATERLOGGED)
  and empties the bucket. Verified (mcbot_waterlog.py): an oak slab changes state on water-bucket use and the held item
  becomes an empty bucket. Placement now also forces waterloggable blocks to place dry.
• Saddle a pig — right-clicking a pig with a saddle makes it rideable (saddle metadata). Verified
  (mcbot_saddle.py): after the interact the pig's metadata sets the saddle flag.

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