Adds rtl features for form elements used in loginuserpass.

As for loginuserpass, fixes a bug that didn't allow to change language after a login error was shown.

The error is shown also if just one of the fields (user or password) is empty.

add document.ready function to script.js where all the calls to selectize are made.
update base.twig. Now script.js is the last script in the list.

Fixed footer at the bottom in fixed position. (+1 squashed commit)
Squashed commits:
[27ac007] footer

Changes default css to adapt the login form.
Need fix: when the user can choose an organization, the layout breaks when opening the dropdown menu.

Each element is defined with an id. it has its own wrap and a "row".

Fix: Missing AuthState parameter when trying to retrieve the authentication state.

Query parameters are passed to the template in order to change language also after an error is shown.

Languagebar is changed to a dropdownmenu.
Use selectize package to show the current language as the first option in the menu.

Build from status.php uses twig to show the authentication status.

the template can be used in different templates.
It highlights rows differently if they're odd or even.
It has 2 flexible blocks that can be used to override a column or add other content.

Classes can be used to readapt it for a specific css framework.

Change the links in the head and postload of base.twig according to the new structure and the recently added packages.

Based on authenticate.php, login.php adds lines 6-26.
The script returns the possible authentication methods for the user, excluded admin.
When only one method is available the user is redirected to the one authentication-method login page.
Calls to right templates are updated at lines 17 and 54.

When no method is found, the user needs to login with admin credentials and check configuration.
The text shown in template is not translated.

Based on appearence configuration the user is redirected to login.php when usenewui is set to true,
or to frontpage_welcome.php for the default design.

ignore files generated with yarn (node.js).

Fix duplicate assertion error using Redis Store

Added tests for SimpleSAML\XML\Validator

Added php-cs-fixer config

Merge branch 'deprecate-assert-with-string' of https://github.com/fentie/simplesamlphp into PR/fentie-deprecate-assert-with-string and fix conflicts.

This can be used by templates to load resources in different ways, either optimized for the developer or for a production environment.

PSR-2 compliance in lib/SimpleSAML/Auth/ directory

Working toward some of the requested tasks in
https://github.com/simplesamlphp/simplesamlphp/wiki/List-of-tasks