Migrate eID handling to psr-7
Using request/response for eID now too.
We will skip openid and a deprecated entry point. (openid will be removed soonish from Core)
[TASK] Migrate eID scripts to use PSR-7
Move all eID scripts to use the request/response model from PSR-7.
A fallback is in place to handle old-style eID scripts.
Reviewed-by: Markus Klein <firstname.lastname@example.org>
Tested-by: Markus Klein <email@example.com>
Reviewed-by: Christian Kuhn <firstname.lastname@example.org>
Tested-by: Christian Kuhn <email@example.com>