v0.4.0

More block and tool interactions, each implemented and bot-verified against a live server.

Added

• Flower pot — right-clicking an empty flower pot with a pottable plant (flower, sapling, fern, …) fills it with
  that plant. Verified (mcbot_flowerpot.py): a placed flower pot becomes a potted poppy (block state 8389 → 16386).
• Cake — right-clicking a cake takes a bite (the BITES state climbs 0→6) and the final bite eats it away.
  Verified (mcbot_cake.py): seven right-clicks step the cake through its bite states (3321 → 3327) then remove it.
• Repeater delay — right-clicking a repeater cycles its delay (1→2→3→4→1 ticks). Verified
  (mcbot_repeaterdelay.py): four right-clicks step the repeater through four distinct delay states and wrap back.

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