Try avoid moving windows when removing/adding monitors

[dalyIsaac]

When Windows removes/adds monitors, it will helpfully move windows to/from monitors. However, Whim is a window manager and we'd like to control this behavior.

To work around Windows' helpfulness, the WindowManager and ButlerEventHandlers ignore all Windows events for tracked windows. This has the downside of potentially missing a window closing, but I've judged that it's more important to keep windows in the correct workspaces.

Other changes include:

• Removing an ineffectual lock
• Updating some calls to obsolete methods
• Another attempt at avoiding AccessViolationException in the Bar

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (57d5381) 81.27% compared to head (7f91bcc) 81.30%.
Report is 2 commits behind head on main.

❗ Current head 7f91bcc differs from pull request most recent head bb5c87f. Consider uploading reports for the commit bb5c87f to get more accurate results

Files	Patch %	Lines
src/Whim/Window/WindowManager.cs	94.73%	0 Missing and 2 partials ⚠️
src/Whim.Bar/BarPlugin.cs	0.00%	0 Missing and 1 partial ⚠️
src/Whim/Context/InternalContext.cs	0.00%	1 Missing ⚠️
src/Whim/Monitor/MonitorManager.cs	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #824      +/-   ##
==========================================
+ Coverage   81.27%   81.30%   +0.03%     
==========================================
  Files         197      198       +1     
  Lines       10227    10212      -15     
  Branches     1142     1140       -2     
==========================================
- Hits         8312     8303       -9     
+ Misses       1790     1785       -5     
+ Partials      125      124       -1     

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