Nyan Cat

Quick patch.

• Re-added entity spawns.
• Added missing recipes for treats

As this build differs in code, it's considered a minor update.

A quick patch which changed some properties and re-implemented some parts.

• Fixed the effect block to self-destruct when its neighbor is destroyed
• Added particles for cats on events
• Fixed the GUI glitch which leads to invalid entity state
• Fixed the entities' speed being awfully high
• What else?