What's the recommended best practice for exporting a library from a package for use in another package?
My specific use case is exporting composable nodes as a shared libraries from some packages and using those in another package that does link-time composition, but I imagine this is going to be a common use case.
>From poking around in the `rclcpp` `CMakeLists.txt`, this is what I've come up with. I'm not 100% sure about the purpose of the `ament_export_dependencies` lines, and I'm also assuming that I still need to manually install include files just like libraries since this seems the logical thing.
```
ament_export_dependencies(ament_cmake)
ament_export_dependencies(rclcpp)
ament_export_dependencies(class_loader)
ament_export_include_directories(include)
ament_export_libraries(displayer_component)
```
It works, but is it correct?
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