This PR implements the item "register a scheduled task for certificate renewal" from the list of requirements described in #7365.
This PR adds required instructions in the NSIS installer for Certbot to create a task, named "Certbot Renew Task" in the Windows Scheduler. This task is run twice a day, to execute the command certbot renew and keep the certificates up-to-date.
Uninstalling Certbot will also remove this scheduled task.
* Implementation
* Corrections
* Update template.nsi
* Improve scripts
* Add a random delay of 12 hours
* Synchronize template against default one in pynsist 2.4
* Clean config of scheduled task
* Install only in AllUsers mode
* Add comments
* Remove the logic of single user install
