Improved coverage Arrow and Axis visuals and fixed some warnings

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Related with gazebosim/gz-sim#1575

Improved coverage Arrow and Axis visuals and fixed some warnings

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 #736 (a4c3a5a) into ign-rendering3 (84724f5) will increase coverage by 1.05%.
The diff coverage is 100.00%.

❗ Current head a4c3a5a differs from pull request most recent head 9d4a36c. Consider uploading reports for the commit 9d4a36c to get more accurate results

@@                Coverage Diff                 @@
##           ign-rendering3     #736      +/-   ##
==================================================
+ Coverage           75.37%   76.42%   +1.05%     
==================================================
  Files                  98      100       +2     
  Lines                7793     7805      +12     
==================================================
+ Hits                 5874     5965      +91     
+ Misses               1919     1840      -79     

Impacted Files	Coverage Δ
include/ignition/rendering/base/BaseArrowVisual.hh	100.00% <100.00%> (+100.00%)	⬆️
ogre2/src/Ogre2ArrowVisual.cc	100.00% <100.00%> (ø)
ogre2/src/Ogre2AxisVisual.cc	100.00% <100.00%> (ø)
ogre2/src/Ogre2Scene.cc	89.84% <100.00%> (+2.28%)	⬆️
src/base/BaseScene.cc	75.89% <0.00%> (+4.89%)	⬆️
include/ignition/rendering/AxisVisual.hh	100.00% <0.00%> (+100.00%)	⬆️
include/ignition/rendering/ArrowVisual.hh	100.00% <0.00%> (+100.00%)	⬆️
include/ignition/rendering/CompositeVisual.hh	100.00% <0.00%> (+100.00%)	⬆️
include/ignition/rendering/base/BaseAxisVisual.hh	100.00% <0.00%> (+100.00%)	⬆️

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