Change usage of library

[MrWook]

Closes: #194

We move away from the painfull singleton usage to a class based approach to handle multiple options at the same time and make it less error prone it different setups.
This way we get the setup like this:

import { ZxcvbnFactory } from '@zxcvbn-ts/core'
import * as zxcvbnEnPackage from '@zxcvbn-ts/language-en'

const options = {
  translations: zxcvbnEnPackage.translations,
}
const zxcvbn = new ZxcvbnFactory(options)

const password = 'somePassword'
zxcvbn.check(password)