LunaLua style guide

This document covers mostly code formatting, rather than programming practices.

LunaLua
Library layout
 * Table declaration
 * Load dependencies
 * Private/exposed variables
 * Private variables going first is preferred.
 * Private/exposed functions
 * Private functions going first is preferred.
 * onInitAPI event handler
 * Other event handlers, ordered by event loop ordering (first global, then per-NPC, for each event)
 * Return statement