Digital Elevation Model (DEM) tutorial

[jennuine]

🎉 New feature

Summary

Tutorial on preparing DEMs and using them in Gazebo.

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)
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[iche033]

nice! I did a first pass review and added some comments

The Ubuntu github CI also picked up some minor lint issues.

[iche033]

I made some changes in bbb4de5:

• Added tutorial to manifest so it appears in the generated doxygen tutorial main page
• Resized images (some were quite big when rendered in the html page)
• Added some more instructions that I had to do when using QGIS
  • btw I don't have the Google Satellite XYZ connection option. I have OpenStreetMap so I added that to the instruction. I'm on v3.34.4 not sure if that matters.
• Fixed texture path in sdf

[jennuine]

Thanks Ian!!

btw I don't have the Google Satellite XYZ connection option. I have OpenStreetMap so I added that to the instruction. I'm on v3.34.4 not sure if that matters.

Hm, I'm using 3.44.3. I'll see if there were separate instructions for google satellite, if so I'll add it in a follow up PR.

@osrf-jenkins please run tests