Keep Illegal Blocks

1. Overview

• Improved cancellation of item spawning events when fragile blocks are broken and restored.
• Improved the second restoration triggered by buttons due to their second physical update.
• Fixed interactable blocks breaking is specific cases.
• Replaced interactable block categories switches with stone-buttons, wooden-buttons and levers.
• Added cave-vines (CAVE_VINES + CAVE_VINES_PLANT) and sweet-berry-bushes as interactable block categories.

2. Overhaul of the restoration system

The restoration system has been reworked to fix all known issues:

• Interactable blocks no longer break when they are also fragile. For example, a lever on a trapdoor could break because a lever is also fragile.
• When the interactable block is a button, a second update occurs a few ticks later (the delay is 20 ticks for stone-buttons and 30 ticks for wooden-buttons). A second restoration is therefore automatically performed at that moment. This is why the switches interactable block category had to be separated into stone-buttons, wooden-buttons and levers categories.
• KIB no longer waits for items to spawn before deleting them. Their spawning event is now intercepted and immediately canceled. In addition, the SPAWN_ENTITY network packet is no longer canceled by the PacketEvents plugin (if present), as this packet is no longer sent when fragile blocks break.