VFS Addon system

[wyozi]

Call filenode:Require("lua-autorun"). Returns a promise that then gives an addon object.

Addon node should be cached in Node.Addons. Addon is initialized on Require on serverside. On clientside (NetFile/NetFolder) the addons serverside file has and are networkable are intiialized immediately on clientside netfile initialization. Node could contain some kind of AddonData thing that stores networked node params.