better translation handling on exceptions

Fix check of valid email domains

improved user validation, added tests

custom services should be able set arbitrary scopes

fall back to parent strings

this avoids empty messages when errors are displayed by the underlying
authplain plugin

lowercase mail

drop concept of GUID and introduce storageID

Previously we created a new GUID for any user trying to login via oauth.
That GUID was used to store the token states. This polluted the cache
area but e

drop concept of GUID and introduce storageID

Previously we created a new GUID for any user trying to login via oauth.
That GUID was used to store the token states. This polluted the cache
area but even worse, it made it impossible to stay logged in on multiple
devices when the IdP invalidated onld access tokens when issuing a new
one (like google does).

Now a session storage is used for the initial login. Permanent storage
is only initialized after a successful login (based on the user's email
address).

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moved token refresh to adapter class

This also takes care of saving the refresh token for when it's not
renewed on refresh (like Google doesn't).

check for request token on login

use refresh token when AccessToken is about to expire

make tests happy about our info config entry

removed obsolete settings from language files

Re-Added custom metadata class for redirect info

replaces #95

use the correct group array when creating user.

replaces #101

fixed button styling

added base service to make things easier for custom implementations

renamed our Service to Adapter to avoid confusion

Also added a mechanism to register Services from an adapter

readd support for farmer setups

In a farm, the return from the IDP will land in the farmer and needs to
be redirected to the proper animal. To do so the animal is stored in the
state parameter which

readd support for farmer setups

In a farm, the return from the IDP will land in the farmer and needs to
be redirected to the proper animal. To do so the animal is stored in the
state parameter which all IDPs should pass back to us as is.

Previously this was hardcoded in the Google service only, now it should
work for all services.

Untested though. Also previously the behavior was also loading the
Farmer plugin even when disabled. I don't know why. I changed it.

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restore proper ID context after login

removed lots of now unused code

make cookie login work, some more cleanup

Use new form event for profile settings. fixes #109

another major refactoring

The new OAuthManager is now the main flow manager and should make it
easier to follow the flow. The Session class encapsulates all session
and cookie accesses. A new guid p

another major refactoring

The new OAuthManager is now the main flow manager and should make it
easier to follow the flow. The Session class encapsulates all session
and cookie accesses. A new guid paradigma should make invisible relogins
possible when the session expired. Needs all major cleanup but a first
login worked.

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removed obsolete files

some type cleanup in Service