Changing products API to nexon.ws, correcting #1

This fixes a recent issue with Nexon pushing out a patch to their APIs prohibiting anonymous solicitation of their products APIs.

As a result of their changes, unreleased and meta games are no longer visible.

WhoEvenWritesTitles

• Fixes issues with downloading manifests that have files with no chunks

Functionality fixes

Thanks Kimchi-senpai 😏

• Fixes chunks not always properly aligning especially in multi chunk files
• Adds chunk verification for existing files, allowing to skip over already downloaded chunks
• Basic implementation of progress tracking
• Interactive implementation allowing to download any product title and manifest
• Adds flag support for automated downloading

Initial Release

Hello World

kty