Import / Export backups

[modos189]

• Added the ability to create backups and restore them

• The add plugins page has become one of the elements of the advanced settings page

closes #112

[github-actions[bot]]

Here are the build results https://github.com/IITC-CE/IITC-Button/suites/14354166315/artifacts/808276486 Artifacts will only be retained for 90 days.

[github-actions[bot]]

Here are the build results https://github.com/IITC-CE/IITC-Button/suites/14443643254/artifacts/815294744 Artifacts will only be retained for 90 days.

[github-actions[bot]]

Here are the build results https://github.com/IITC-CE/IITC-Button/suites/14666520033/artifacts/832330373 Artifacts will only be retained for 90 days.

[github-actions[bot]]

Here are the build results https://github.com/IITC-CE/IITC-Button/suites/14666535076/artifacts/832331403 Artifacts will only be retained for 90 days.