Support for ES6 functions about rapydscript HOT 1 CLOSED

Thanks, I've added the ones that I was able to find explanations for online that made sense. There are a few missing (raw, fromCodePoint) because I couldn't find a reasonable explanation of what they do (I assume raw is similar to Python's r"", but I don't understand how it would work - if it takes a non-raw string it defeats the benefit of Python's raw to begin with - which is not having to deal with extra escaping), but I don't mind adding them if you actually need them.

Also, I didn't add parseInt and parseFloat since those already exist as independent functions and the spec didn't seem to have reached a consensus on what to do with them yet (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt)

from rapydscript.