v2.0.0

@rebornplusplus 's initial implementation

Built upon @mahdihasnat's changes (v1.0.0), this is mostly a rewrite. Hence, it contains BREAKING CHANGES.

Noteworthy changes:

• printer assignment per user.
• User bulk-addition UI.
• Removal of user submissions page.
• Very minimal package dependencies.

Full Changelog: v1.0.0...v2.0.0