Run the client and server in separate instances of the mods

[SoniEx2]

For each mod, you make one instance of the main mod class for each game environment (client or server) in the same JVM. So a local 2-player game with an internal server would have 3 instances of each mod, while a dedicated server would have 1 instance and singleplayer would have 2 instances.

This reduces pains with regards to sidedness and having to keep track of it. Mods would just be able to use environment-global instances (accessed through Environment objects) without having to worry about it.

I believe @amadornes and anyone who has ever played with implementing wireless redstone would love this.

[RX14]

This might be something for later on, which mods can opt in to.