Removed all non-existence keywords

[rilysh]

After TypeScript 2.0, there're a lot of changes were implemented. Therefore some keyword like goto no longer available in ts. According to ECMAScript 2020 standard, this keywords aren't available in js as well. For int or float, they're not data types, there's only one type is number which accepts integer & float both. To get true integer, there's BigInt available.

http://www.ecma-international.org/ecma-262/6.0/index.html#sec-ecmascript-language-types-number-type