look it up from the metadatadir from configuration variable

Instead of hardcoding the metadata directory, look it up from the metadatadir configuration variable

- Make textarea and code-box monospace (might be subjective)
- Jump to converted data after form submit
- Make file upload label work

Closes: #1094

Closes: #1102

The calling code of the template had been changed to accommodate
new twig templates, but slightly changed the content of the
template variables so preferredidp never matched the list of known
idp's. This fixes it in the least invasive way. Could be
refactored because we now loop the idplist twice, but since this
is legacy code that's likely not worth it.

Thanks Stefan Winter from RESTENA for reporting.

The radius-module was externalized earlier

Because it's used in the _REQUEST array, the name is changed by PHP
to replacethe dot with an underscore, leading it not to match, that
in turn breaking the exception handling.

Thanks pverbaan for reporting this issue.

Closes: #1077

* Externalize consent module

* Update Psalm

* Ignore DocblockTypeContradiction and RedundantConditionGivenDocblockType

* Fix Psalm-errors

* Raise minimum PHP-version to 5.6

* Update lock-file accordingly

* Fix phpunit

* Suppress Psalm-issue

* Create .appveyor.yml

* Fix tests for Windows platform

* Fix builtin webserver for Windows

* Properly kill process on Windows

Handle untranslated tabs more gracefully in discopower-module

We no longer test on HHVM