fix for #300

[FiloSpaTeam]

Now before folder deletion, check if there are unexpected files and warn the user.

[codecov]

Codecov Report

Merging #363 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #363      +/-   ##
=========================================
- Coverage    6.38%   6.34%   -0.04%     
=========================================
  Files          39      39              
  Lines        2695    2710      +15     
  Branches      351     355       +4     
=========================================
  Hits          172     172              
- Misses       2517    2532      +15     
  Partials        6       6

Impacted Files	Coverage Δ
src/mainwindow.h	0% <ø> (ø)	⬆️
src/mainwindow.cpp	0% <0%> (ø)	⬆️

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[coveralls]

Coverage decreased (-0.02%) to 6.266% when pulling 64ddef2 on UnitooTeam:master into bd33d9c on IJHack:master.

[coveralls]

Coverage decreased (-0.01%) to 6.277% when pulling 04c7c89 on UnitooTeam:master into bd33d9c on IJHack:master.

[FiloSpaTeam]

I added a new QAction to open folder directly from QtPass using QDesktopServices