Minecraft Randomizer

Added world events, which are rarer:

• Gravity of other entities -50%
• Scale of other entities +45%
• Scale of other entities -55%
• Gamerules randomly toggled:
  • Do daylight cycle
  • Do fire tick
  • Do mob spawning
  • Keep inventory
  • Lava source conversion
  • Locator bar

Also added player events to summon certain entities and mobs.