Release 10.0.0-alpha.5 -- more fixes for SimpleSAMLphp 2

[briskt]

Changed

• Update Twig templates to recommended style (space after colon, snake case vars)

Fixed

• Changed getString to getOptionalString (and similar changes)
• Instantiate SimpleSAMLphp Utils classes
• Define variables needed in the header template (analytics_tracking_id and theme_color_scheme)

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
4.8% Duplication on New Code

See analysis details on SonarCloud

[briskt]

The whole swap to snake case made this extra long. Hopefully there are no values missing in the midst of all those cuts and changes.

You're right. Fortunately, since the check for undefined template variables is enabled, and we have good test coverage, I think we're safe.