Add oauth login functionality

[melvyn2]

Because we have access to creating OAuth tokens, I thought it might be useful to use them to log in more easily. If any code style changes/refactoring needs to be done, I'd be happy to do it.

[rossengeorgiev]

If I understand this correctly, once I login with mobileauth (user+pass etc) I get oauth_token that I can use with the API to re-authenticate at a future time? And I need to know the correct steam_id? (its not provided by GetGWToken?)

[melvyn2]

Yes; once you have a token, you can use it until it gets revoked (which seems to be random). Then, you must get a new one, which does require the username and password. The steam_id is also required. I believe I have also fixed all the notes above.

[rossengeorgiev]

Thanks. I will need to try this out and figure out how this would fit in the class. Wondering whether it might better to implement it as a "remember password" feature.

[rossengeorgiev]

Sorry, this PR has been sitting for a while. Happy to merge

[melvyn2]

Ah, sorry for the delay: I've rebased the branch onto master. Does anything else need to be done before merging?

[melvyn2]

Alright, I've managed to fetch and confirm mobile confirmations w/o the steamid cookie, and verified that the cookie is not present on the desktop site (mobile may still have it, but I don't see why it would). Should the commits be squashed, or left as-is?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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