Use ros2_control_cmake (backport #588)

[mergify]

Needs ros-controls/ros2_control_cmake#7 first

in gz_ros2_control we have CMAKE_C_STANDARD 11, was there a reason for a different setup than the official guidelines?

Not sure about CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS, no one ever requested this for windows builds. Maybe it is not even necessary for plugins.

---

This is an automatic backport of pull request #588 done by Mergify.

[mergify]

Cherry-pick of a5c5448 has failed:

On branch mergify/bp/humble/pr-588
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit a5c5448.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   gz_ros2_control/CMakeLists.txt
	modified:   gz_ros2_control/src/gz_ros2_control_plugin.cpp
	modified:   gz_ros2_control_demos/CMakeLists.txt
	modified:   gz_ros2_control_demos/package.xml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   gz_ros2_control/package.xml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[christophfroehlich]

we haven't released it to humble