Promote MCServer on other platforms

[xoft]

I'm with bearbin. If we promote too early, the users will try, see that they don't like it, and we lose them forever. We need to be more feature-complete before we go big.

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As for what is missing, I think the complete survival experience needs to be done before promoting. This means:
- complete the enchantments and their effects
- overhaul the AI to become challenging
- fix monster spawning rules (no more green sheep)