Getting the players name as a variable

I think this is a good idea to add in the new update, with the world specific variables and all. The possibility to get the players name allows us to make not only world specific variables, but to also make them player specific. This could also be a way to add support for multiplayer. It'll also allow us the ability to make player specific content (let's say a gift for a helper under the form of an item every time he/she makes a new world).