Add new "firefly" block effect. This can be attached to any block, but by default it will attach to the Minecraft flower and double flower blocks (poppy, rose, peony, sunflower, etc.). Fireflies will spawn around these blocks under the following conditions:

• Not raining
• Night time
• Not a snowy or desert biome
• Biome temperature is MEDIUM or WARM

Should make gardens interesting at night.