OnDropFiles: Add support for spaces and quotes in filename

[mwestphal]

OnDropFiles() needs to escape quotes in filenames before adding quotes around them.
Also TriggerBinding() should add a space between commands and first argument instead of expecting said space to be there already.

Test for spaces in filename is not supported by the interaction testing mechanism.
Test for quotes in filename is supported but github actions do not like quotes in filenames, so testing is limited.

Superseed #1725

[mwestphal]

@snoyer @Meakk please review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.96%. Comparing base (78ff702) to head (35f1cf3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1728      +/-   ##
==========================================
- Coverage   96.96%   96.96%   -0.01%     
==========================================
  Files         108      110       +2     
  Lines        8792     8823      +31     
==========================================
+ Hits         8525     8555      +30     
- Misses        267      268       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles