First pass at level1 clazy checks for qt

[mjcarroll]

Cleaning up clazy warnings to make sure we are using Qt correctly.

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (ce37179) 70.05% compared to head (4319ec7) 70.14%.

❗ Current head 4319ec7 differs from pull request most recent head bc58d59. Consider uploading reports for the commit bc58d59 to get more accurate results

Files	Patch %	Lines
src/plugins/point_cloud/PointCloud.cc	30.76%	9 Missing ⚠️
src/plugins/screenshot/Screenshot.cc	0.00%	4 Missing ⚠️
src/plugins/grid_config/GridConfig.cc	0.00%	3 Missing ⚠️
src/plugins/marker_manager/MarkerManager.cc	25.00%	3 Missing ⚠️
src/plugins/topic_viewer/TopicViewer.cc	0.00%	3 Missing ⚠️
src/plugins/world_control/WorldControl.cc	72.72%	3 Missing ⚠️
src/PlottingInterface.cc	90.00%	2 Missing ⚠️
src/Plugin.cc	93.93%	2 Missing ⚠️
src/Application.cc	96.29%	1 Missing ⚠️
src/MainWindow.cc	96.15%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #584      +/-   ##
==========================================
+ Coverage   70.05%   70.14%   +0.09%     
==========================================
  Files          38       38              
  Lines        5356     5343      -13     
==========================================
- Hits         3752     3748       -4     
+ Misses       1604     1595       -9     

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