add "Edit" menu with "Select All" and "Copy"

[oltolm]

Closes #57.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.11%. Comparing base (2d9c0d1) to head (7da2127).

Files with missing lines	Patch %	Lines
src/drmingw/dialog.cpp	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   52.33%   52.11%   -0.23%     
==========================================
  Files          15       15              
  Lines        1884     1892       +8     
  Branches      710      712       +2     
==========================================
  Hits          986      986              
- Misses        676      684       +8     
  Partials      222      222              

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