v5.0.0 Stable

Refactored some code and made the site cleaner. Slightly less mobile support, more soon to come. Removed some unneeded bloat as well.

v5.0.0-ptb1

OkayuCDN Version 5.0.0 Public Test Build 1
Fixes bugs and started backend rework, along with design improvements to frontend.

Known bugs/code issues:

• Maintenance mode does not work
• GET /login does not use req.query.redir
• Admin color scheme is not correctly displayed
• /wallpaper does not scale to mobile devices
• Token generation is not cryptographically secure (server will clean tokens on boot in ptb2)
• Cache directory is not cleared on boot (todo in ptb2)
• File uploads will not complete if the server is saving to another drive (Cross-Device Link is not permitted) (todo in ptb2/3)