Add support for MCPC+ servers

Allows running SilkSpawners in an obfuscated environment, e.g., MCPC+:

http://www.mcportcentral.co.za/index.php?topic=4657.0

Also added EntityType to the verbose output since it was useful for debugging an issue (https://github.com/MinecraftPortCentral/MCPC-Plus/issues/16 if you're curious)

Cheers