Update urdf/model.h -> urdf/model.hpp

[sea-bass]

Seems the deprecation warning came in with a linting PR to the urdf repo: ros2/urdf#39

[sea-bass]

Since this URDF deprecation warning change was only added to Rolling via the latest urdf repo changes, we will need to create separate humble / iron branches, and then have jazzy / rolling move on from this change. This is because those branches do not have model.hpp.

@henningkayser @sjahr Are you guys willing to help get this set up?

[henningkayser]

@sea-bass thank you! I'd be happy to set up those branches, but is it worth it just for missing headers? What do you think about just using include conditions like here /~https://github.com/moveit/moveit2/pull/598/files

[sea-bass]

@sea-bass thank you! I'd be happy to set up those branches, but is it worth it just for missing headers? What do you think about just using include conditions like here /~https://github.com/moveit/moveit2/pull/598/files

That would work even better! Wasn't aware of those, and can try it out later. Thank you.

Also, I already set up those branches, but we can probably delete them if the include conditions work out.

EDIT: Yep, that worked perfectly. Done!