Exclude Jrebel Config. (+1 squashed commits)
Update WorldInfo-Common and exclude jrebel's rebel.xml from license formatting requirements.

Also added IDEA's default build output directory to gitignore.
Add new helper method from common library.
Removed unneeded code.

1. Proxied Event listeners were not needed. Will used SideOnly annotation instead.
2. Fixed some missing registrations for Settings.
3. Updated common code. (+2 squashed commit)
4. Moved CommonListener to commonlib.
5. Remove unused checkstyle file. Removed duplicate git ignore entries.
Create the 4 primary packets for usage with Mod.
Also updated the Common code to latest dev branch.
Fixed some logic flaws in settings.
Update WorldInfo-Common and implement missing code from previous and current update.
Added new Debug command and items relating to single player and multiplayer.

WARNING: Multiplayer will not have a debug item!

Some stuff has been added but not fully working.
This include network handlers for packets and the ForgeListener for joining servers and worlds to request information about the world.
Create new CustomName packet for use. Shifted the seed packet up an index as a result to keep alongside name packet.
Additionally:
Network handlers are handling the new packet
Network handlers will follow the current config settings for if the packet is enabled or disabled.