[Feature Request] Oauth2 to have auth URL separate from token URL

[CKY-]

Describe the solution you'd like Enter a clear and concise description of what you want to happen. to follow RFC6749 the Authorization server and Resource server while not always can/should be different endpoints. while messing with oauth2, I ran into a situation that needed the auth server and the token server to be different.. firebot currently only accepts one endpoint for auth and token.

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