PIMPL GUI events

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 Enhancement

Summary

PIMPL GUI events. @scpeters let me know if you target a specific ign-gui version.

Checklist

• Signed all commits for DCO
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #253 (59e1d0f) into main (1190ed0) will increase coverage by 3.75%.
The diff coverage is 56.67%.

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   61.57%   65.32%   +3.75%     
==========================================
  Files          21       27       +6     
  Lines        2803     3989    +1186     
==========================================
+ Hits         1726     2606     +880     
- Misses       1077     1383     +306     

Impacted Files	Coverage Δ
include/ignition/gui/GuiEvents.hh	100.00% <ø> (ø)
src/Conversions.cc	100.00% <ø> (ø)
src/plugins/image_display/ImageDisplay.cc	30.32% <0.00%> (+7.05%)	⬆️
src/Plugin.cc	57.44% <17.64%> (-2.83%)	⬇️
src/plugins/screenshot/Screenshot.cc	33.33% <33.33%> (ø)
src/plugins/minimal_scene/MinimalScene.cc	51.70% <51.70%> (ø)
...s/transport_scene_manager/TransportSceneManager.cc	52.29% <52.29%> (ø)
src/plugins/camera_tracking/CameraTracking.cc	68.45% <68.45%> (ø)
src/plugins/scene3d/Scene3D.cc	48.89% <71.51%> (+36.11%)	⬆️
src/Application.cc	84.89% <100.00%> (+0.20%)	⬆️
... and 10 more

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[scpeters]

@scpeters let me know if you target a specific ign-gui version.

this breaks ABI, so it has to go to main

[chapulina]

Thanks! LGTM