Added login UI

[Zentro]

This will add the ability to log into your Rigs of Rods account from inside the game. This replaces the "user token" system currently in place with something that requires much less hassle.

How to test:

1. At the very top of the main screen, click "Login". Enter your forum credentials and if prompted test each two-factor option.
2. Verify the top of the main screen shows your avatar and username
3. Close the game, and reopen it. Verify that your user profile is loaded again from the main screen.
4. Click "Log out", your account should be cleared and avatar cache cleared

What to look out for:

1. If you have two-factor authentication, please make another account and/or disable two-factor to test logging in with and without two-factor.

Currently, the login dialog box works along with the additional two-factor steps.

• Migrate our databases to DO managed databases services
• Get the XF addon production ready
• Push changes to carbon (the API), will be accessible from https://v2.api.rigsofrods.org/auth
• Download user avatars into a cache
• Logout and clear user avatar cache
• Update RoR server to allow a 2 way key exchange for ranked users (gutting the user token system)

I've attached an older video for demonstration.

1.mp4

[ohlidalp]

Code looks perfect from my perspective 👏

[Zentro]

We have a working solution here, needs code clean up still.