Show notification on login when license is expired/exceeded

When using supported packages, the use of a subscription is required (also see KW-3480). When the subscription is expired, or the number of active users exceeds the subscription values, a notification should be shown on login to all users.

Expected

Text suggestion

Title: License error
Text: The installed license key(s) have expired or the number of users is being exceeded. Please contact your system administrator for further information.

Interval
The validity of the license should be re-checked every 60 minutes - and the message should be shown again if required.

Note: Users in a multi-tenant setup (means the flag 'payperuse' is enabled in the license file) should not receive this message.

Pseudo-code for checking licenses in WebApp

if license does not have "payperuse":
    * if "license not ok": red flag (see KC-1821)
else: 
    green flag
endif

Check if the module exist before calling this module, since master builds will not depend on the module.
Link to module: https://master.zbuild.net/package/show/kustomer:master/php-libkustomer