Update Forge implementation.

Including:
* Update to new MCP names
* Adding of an build script (see maven 'forge' profile)
* Adding of an regeneration code
* Simplifying of the command registration
* Added command usage description to avoid empty help pages
* Added missing raw information
* Used a WeakReference as world reference to avoid keeping a world in memory
* Added mcmod.info
* Fixed player orientation
* Fixed printRaw not splitting the message correct