Avoid usage of fs, Buffer and querystring

[Amoki]

This lib uses fs, Buffer, and querystring that are nodeJS modules.
Rollup and Webpack use polyfill but that adds many KB of javascript to download.

Here are the available language & frameworks in OpenAPI Generator:

• Node.js/JavaScript (ES5, ES6, AngularJS with Google Closure Compiler annotations, Flow types)
• Typescript (AngularJS, Angular (2.x - 8.x), Aurelia, Axios, Fetch, Inversify, jQuery, Node, Rxjs)

I'm thinking about using the TypeScript lib with Fetch. We can easily compile the TS into JS and use them is standard app.
What do you think @Kurtil?

[Kurtil]

Fetch seems a good choice

[Amoki]

Typescript-Fetch has a naming conflict caused by the same methods accessible from CollaborationApi and IfcApi.
TypeScript-Axios seems to works well but I can't manage to publish it. The axios dependency won't be included in the built file and running import axios from 'axios' doesn't work in browsers...