1.1.2 release

[boxanm]

Summary:

Prep for a release that adds an API documentation website and uses a package.xml file to set the library's version in CMake.

[RedLeader962]

@boxanm Look good, good job. Did you test the github action output e.g. with https://github.com/nektos/act ?

When you are ready, merge the 1.1.2 release branch into the release branch and open a PR from release to master, it will trigger the CI check. I will approve the PR there.

PS For your information:

• the libnabo release docker image is build with the --generate-doc flag, so you can use this docker image in any github action to fetch build artifact e.g.: from ./build/doc/html/* (from the docker image into your github action step). It's faster and save build credit;
• the repo has install scripts that manage doc install/build that you can reuse in any github action if it can help. They are designed and test to be use both by CI system and end user so they are flexible and reliable.

  cd build_system/ubuntu/
  bash nabo_install_dependencies_ubuntu.bash
  bash nabo_install_doc_dependencies_ubuntu.bash
  bash nabo_install_libnabo_ubuntu.bash --generate-doc

  Those are just nice to know, no need to refactor your code.

PPS I plan to deploy the tools for automatic releasing of both libnabo and libpointmatcher around the end of the summer.

[boxanm]

Yeah I tested the action with act. I'll proceed with the merge, and we can fetch the build artifacts in the next PR.