This release has a major new feature: Remote upgrade
Also put emphasis on better GUI experience.

Note: These releases are not signed with an EV certificate yet.

Features

Added a full auto-upgrade solution:
- Aupgrade client integrated into NPBackup, that can be called manually via --auto-upgrade or automatically run every n backups
- Upgrade server which servers files and their metadata
Added a gui to create a scheduled task under Windows
Added a gui to configure backup admin password (was compile time setting before)
Made windows cloud file filter optional (enabled by default)
Add variable substitution in configuration
Add machine identification in configuration
Add variable ${RANDOM}[n] to config file in order to distinguish non unique hostnames
Make backup state and upgrade state messages more coherent

Fixes

Fix config fails when restic password is an int
Fix empty config files did not show a proper error message
Fix various config file malformation will break execution
Fix backup hangs when no restic password is given (restic asks for password in backgroud job)
Fix error message in logs when repo is not initialized

Improved setup.py to provide launch scripts for both Linux and Windows platforms
Added default configuration settings
Rewrite configuration gui into a tabbed gui
Updated restic binary to restic 0.15.1 compiled with go1.19.5
Changed backup interval unit from seconds to minutes