This PR aims to allow project using jrl-cmakemodules to be used under the same root CMakeLists.txt (workspace).

• Use unique target name (prefixed by project name)
• Keep old target as aggregators
• Allow to deactivate the automatic call to setup_project_finialize (called in the workspace CMakeLists.txt instead of the project CMakeLists.txt)
• Reformat some custom_target
• PROJECT_PACKAGES_IN_WORKSPACE that should avoid running find_package in ADD_PROJECT_DEPENDENCY and ADD_PROJECT_PRIVATE_DEPENDENCY on project already in the workspace
• Add ADD_PROJECT_PRIVATE_DEPENDENCY that check for PROJECT_PACKAGES_IN_WORKSPACE before calling find_package
• Add PROJECT_PYTHON_PACKAGES_IN_WORKSPACE to include Python modules from workspace in PYTHONPATH
• Use PROJECT_SOURCE_DIR and PROJECT_BINARY_DIR instead of CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR since the

dist and doc target is working with multiple project but distcheck is not working. Since distcheck do some very heroic thing with the CMakeCache.txt, I don't think we can make it work for multiple project.