Implemented typeof, instanceof and overloads - #128

This typeof implementation could cause some issues with type narrowing: IIRC, TS expects typeof to return "string" | "number" | "array" | "function" | "boolean" | "object", while lua's type will return "table" instead of "array" or "object".

I don't think array is a thing, I can't find any references to MDN, also typeof([]) gives me "object" in Chrome. I was discussing with @lolleko wether we should be returning "table" or "object", I think table should be fine as long as we document it properly.

I might have misremembered that with "array" then. My concern was mostly that if you have const something: object | number, if (typeof something === "table") won't successfully perform type narrowing. In fact, in recent versions of TS, I think it even produces a compiler error if you try to compare an unknown constant to a typeof result.

Ah yes that is a good point, I will change that, we will probably translate to type(...) == "table" and "object" or type(...)