Overhaul authentication

[Katsute]

Prerequisites

• I have checked that no other similar feature request already exists.
• This feature request makes sense for the project.
• I have checked that this feature does not already exist.
• I am running the latest release version.

Feature

See #270

• Debug logging should mask auth token (for security reasons) #265
• Allow debug mode #265

Reason

• Allow more auth flexibility for developers
• Allow refresh tokens to actually be usable

[Katsute]

@sinon-bot branch debug

[Deleted user]

New branch created debug@50e3f69

_{This branch was created by @Katsute.}

[Katsute]

@sinon-bot branch auth

[Deleted user]

New branch created auth@bfef5ed

_{This branch was created by @Katsute.}