Output Lua annotations for editors

[Tempystral]

Because Bizhawk's Lua functions are created inside Bizhawk, they can't be seen by external editors like VSCode.

The Lua console already has functions for generating code completion tags for Sublime Text/Notepad++, but this code is unfinished and not part of the Lua language. However, there's a better solution.

What would be awesome is an annotations file that could be added/linked into our projects. That way we could use any editor we like and get language support outside the bizhawk Lua console.