Build 0.5.8

Some more minor changes and tweaks.

- Updated the main menu with a more suitable font

- Added some more placeholder gear items, namely a few different armors

- Equipping items is currently bugged in the menu. The item will be equipped, but it won't show until you exit the inventory menu. Will be fixed tomorrow

- Added a new Register option in the main menu, allowing users to sign up with a username and password instead of only through a Unity Player Account. Sign in function is still not finished, but in the meantime registering will automatically sign you in to the created account. There are various issues with this feature still, will be addressing soon.