* SQL: changed init session table so it will work on MSSQL Databases

* SQL: changed rowCount by count of fetchAll
rowCount does not always returns number of rows on SELECT queries, i.e. MSSQL returns -1

PSR-12 compliancy

As commented in #1155 1155

A dot or a comma is quite a difference!

This includes instructions on how to use SimpleSAMLphp with the PHP session backend while you are using it too in your application, also with a custom session handler.

source text does not need to go through internationalization as it is already handled by the text specified in the authsources file.

* Ensure getConfig* functions can only return Configuration

* Cleanup after #1189

* Deprecate Configuration::getConfigList

Fix typo

correct exampleauth namespace name

This allows us to default to the error log, while also not breaking SSP completely. If we cannot initialize the logging handler, then we resort to the web servers log and log a critical error.

This resolves #1194

bugfix: Do not flush logs after creating a session handler, we might not have a track ID and therefore the log will be trashed.

This (finally!) resolves #1176

Fix Psalm-issues batch #3

This is due to a recent change in master. We're no longer trying to fill the sessionID for transient sessions (doesn't even make any sense), so everywhere else where we were checking the session ID (e.g. to store the session) we need to check if it's transient instead, and give up in that case.

Also, `$instance` can actually be `null` internally.

The new `$initializing` property should signal that we are initializing the logging handler with a value of `true`, not the other way around. Also, it should only be set to `true` while we are actually initializing the logging handler.

The list of main contributors was very outdated.

Stats fix