Release 10.0.0-alpha.4 -- update to SimpleSAMLphp 2.2.2, now functional in IdP mode

Updated SimpleSAMLphp to 2.2.2 along with all required dependencies
Rename all lib directories to src
Rename all www directories to public
Added PHP type-hinting in module code
Updated dockerbuild/config/config.php using the latest SimpleSAMLphp example file (config/config.php.dist).
Use the config.php file in the ssp-base image for local development and for automated tests, lightly modified.
Changed NameIDPolicy because it must now be an array. Reference IDP-1115
The SimpleSAML\Utils classes now require instantiation to call member functions because the methods are no longer static. IDP-1103
Converted material module templates to use Twig IDP-898
(Temporary) Disabled sildisco IdP discovery and reverted to standard SimpleSAMLphp IdP discovery.

Removed Vagrantfile
Removed core:StatisticsWithAttribute authproc as it was moved to another module that is not enabled by default.

silinternational / ssp-base