Metamorph

This is a small patch update which is mostly oriented toward Blockbuster's compatibility.

• Added mclib library mod as a dependency
• Added morph merging API
• Added custom payload listener (now plugins are able to modify of the players via custom payload packets)
• Fixed issues with player render mods (like Mo' Bends or Emoticons) by changing player morphing animation
• Full rewrite of Metamorph's GUIs to support McLib GUI framework
• Prevent morphing into the bounds of other blocks (added by asanetargoss)
• Removed morph builders (but replaced with morph editors)