Reset settings admin

[ar0ne]

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name: Reset setting (admin part)
about: Add button to admin panel that resets settings to default values
assignees: fabiocaccamo

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This branch coupled with #128 and could be merged only after it.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.77%. Comparing base (fd891da) to head (8c2cb76).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   85.51%   85.77%   +0.26%     
==========================================
  Files          21       21              
  Lines         435      443       +8     
==========================================
+ Hits          372      380       +8     
  Misses         63       63              

Flag	Coverage Δ
unittests	85.77% <100.00%> (+0.26%)	⬆️

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[fabiocaccamo]

@ar0ne I see a lot of duplicated code of #128, I think it's better to wait until #128 will be merged and then rebase this one before continuing to work on it.