Support the authentication based on API tokens

[stof]

The UI says that auth based on access key and secret key is deprecated in favor of api keys.

The doc about them is not great yet though, so you may have to contact the support to get details (and the official PHP client seems unmaintained so you cannot just look at it)

[xabbuh]

Thanks for pointing to this @stof. I haven't looked at their API doc for some time. This should definitely go into version 2 of the library (having it in the next minor would even be better to have a smoother upgrade path though).

[stof]

I agree about putting that in a minor version instead.

[stof]

Hmm, actually, this also involves using a newer version of the API, so I'm not sure it is easy to do in a minor version.
But this is definitely needed. The web UI does not display the access key and secret key needed by the API v2 anymore (the current version of the API is v4).

[stof]

btw, they are not even named PandaStream anymore...