Extract operating system from user agent and store it in database
record.
Another widget is added which displays the page views per operating
system.
An command is provided which will update existing data.
10.4 introduced breaking changes for dashboard widgets.
The necessary changes to stay compatible are done within this commit.
No need anymore to configure widget through PHP, instead DI is used.
Instead only PHP to provide data is used.
* Adjust names of tasks.
* Add composer require checker.
* Install without plugins to not use custom installer and stay
compatible with require checker.
* Stay phpunit 10 compatible.
