UI driven cron and daemon wizard

[christianTF]

Create a UI driven tool to create a Daemon (startup) and cron job

• User selects a script to run as a daemon
• UI driven selection of times as known from crontab
• Creates or edits existing crontabs
• Prevents editing of Plugin and system crontabs
• uses a cron.d file
• Sets correct permissions for job and script
• possibly checks the script for correct shebang

Could be a tab in LoxBerry Services Should be secured by SecurePIN Can be based on the crontab library that LoxBerry Backup uses