monkey patch for oauth lib github

This manually applies Lusitanian/PHPoAuthLib#567 once it has been
merged, a proper composer checkout should be used again

initial begin of refactoring

using composer for the oauth lib dependency, autoloading for our own
classes. Services are now their own action plugins to inherit from our
Service class.

All still unt

initial begin of refactoring

using composer for the oauth lib dependency, autoloading for our own
classes. Services are now their own action plugins to inherit from our
Service class.

All still untested and broken

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