Demo Modus
- If no license key ==> Provide a button to activate the demo mode.
- Demo mode sets a sys_registry entry with a lifetime of max. one day.
- Add a counter to the backend module inside the button after the activation to make pressure
- If the demo mode ends after one day, all generated files are removed again. Do this check INSIDE the userFuncs AND the backend module.
- Describe the demo mode after activation in a small box in the backend with the information how this works.
- Demo mode can be activated max. 3 times