Added <shininess> to <material>

[WilliamLewww]

🎉 Added <shininess> to <material>

Summary

When using default shaders in gazebo, the ogre's default shininess is 0 causing the specular components to have no effect. Without having a shininess element, we are unable to utilize specular highlights with default shaders.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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.

[ahcorde]

CI

/github/workspace/include/sdf/Material.hh:119:  Line ends in whitespace.  Consider deleting these extra spaces.  [whitespace/end_of_line] [4]

[codecov-commenter]

Codecov Report

Merging #985 (380af1b) into sdf9 (1491d72) will decrease coverage by 44.10%.
The diff coverage is n/a.

❗ Current head 380af1b differs from pull request most recent head 5329adb. Consider uploading reports for the commit 5329adb to get more accurate results

@@             Coverage Diff             @@
##             sdf9     #985       +/-   ##
===========================================
- Coverage   87.58%   43.47%   -44.11%     
===========================================
  Files          63        1       -62     
  Lines        9963       23     -9940     
===========================================
- Hits         8726       10     -8716     
+ Misses       1237       13     -1224     

Impacted Files	Coverage Δ
src/Material.cc
src/Cylinder.cc
src/Atmosphere.cc
src/Box.cc
src/parser.cc
src/Joint.cc
src/SemanticPose.cc
src/Noise.cc
src/SDFImplPrivate.hh
src/Utils.cc
... and 54 more

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[iche033]

how about also updating the Load function to load shininess value from SDF?