Change the util/base64 function names to start with lowercase

[aceshim]

By following the common javascript convention, I suggest all function names to be camelCase (or at least start with lowercase). Especially when remarks can be misunderstood as a type instead of a function when imported somewhere else.

current

import { Base64 } from 'js-base64';

export const Base64urlEncode = Base64.encodeURI;

export const Base64urlDecode = Base64.decode;

export const Uint8ArrayToBase64Url = (input: Uint8Array): string =>
  Base64.fromUint8Array(input, true);

to-be

import { Base64 } from 'js-base64';

export const base64UrlEncode = Base64.encodeURI;

export const base64UrlDecode = Base64.decode;

export const uint8ArrayToBase64Url = (input: Uint8Array): string =>
  Base64.fromUint8Array(input, true);

[lukasjhan]

Yeah. It's reasonable. I'll fix it right away :)