OAuth2: enable state parameter by default #162
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As a first, simple step to fix #161, I propose to enable the state parameter by default. In contrast to
nonceandcode_challenge, it is already implemented in lusitanian/oauth.stateis also the oldest and well established mechanism of the three, so I expect that most providers support it. If any provider does not support it, it can be disabled again by overwritingService.needsStateParameterInAuthUrl().I understand that this is a breaking change, but I think offering secure defaults is worth it.