Common widget GzColor (Fortress)

[AzulRadio]

New feature

• Part of Provide reusable QML components with common widgets #310

Summary

Pack RGB color GUI into a common widget GzColor.qml

Replace the color GUI in GridConfig with the common widget

TODO: Also replace Lights.qml and Material.qml in component inspector

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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 and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #411 (5a62bf8) into ign-gui6 (2ba68b8) will increase coverage by 35.13%.
The diff coverage is n/a.

❗ Current head 5a62bf8 differs from pull request most recent head b7f3663. Consider uploading reports for the commit b7f3663 to get more accurate results

@@              Coverage Diff              @@
##           ign-gui6     #411       +/-   ##
=============================================
+ Coverage     30.54%   65.68%   +35.13%     
=============================================
  Files            41       39        -2     
  Lines          1748     5182     +3434     
=============================================
+ Hits            534     3404     +2870     
- Misses         1214     1778      +564     

Impacted Files	Coverage Δ
src/plugins/screenshot/moc_Screenshot.cpp
src/plugins/publisher/qrc_Publisher.cpp
src/plugins/scene3d/moc_Scene3D.cpp
src/plugins/grid_config/qrc_GridConfig.cpp
src/plugins/minimal_scene/moc_MinimalScene.cpp
include/ignition/gui/moc_MainWindow.cpp
src/plugins/camera_tracking/qrc_CameraTracking.cpp
src/plugins/shutdown_button/qrc_ShutdownButton.cpp
src/plugins/teleop/qrc_Teleop.cpp
src/plugins/key_publisher/moc_KeyPublisher.cpp
... and 70 more

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