Support for MCPatcher's "Random Mobs" and OptiFine's "Random Entities"

[NatoBoram]

I think there would be more demand for compatibility with previous formats before new formats are necessary. For example, I want to use Alternate Entities, but it's not really possible at the moment.

• MCPatcher's "Random Mobs"
• OptiFine's "Random Entities"

[supsm]

You can use MCPPPP to do conversions, however, varied mobs is currently incomplete, and therefore MCPPPP conversion also does not work.