Removed libyarpc

[randaz81]

Removed UNMAINTAINED library libyarpc.
A backup copy will be kept for reference in the following repo:

• https://github.com/robotology-playground/yarp-libyarpc

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update the release notes by adding a file in doc/release/<target_branch>, based on your changes.

[randaz81]

Generated by:

In the source repo (a clean copy of yarp called yarp_clean)

git filter-repo --path src/libyarpc --refs refs/heads/master --force

in the dest repo (yarp-libyarpc)

git remote add repo-source ../yarp_clean
git fetch repo-source
git branch branch-source remotes/repo-source/master
git merge branch-source --allow-unrelated-histories
git push origin