[v4.3.9] Minor improvements
Changed
Improve helpers readability.
Put one-line helps to get whole picture of functions available.
Fix examples (server/client), and export functions to ease scripts integration.
Also, move .src files to .bash files.
Docker images
https://github.com/users/testillano/packages/container/package/h2agent
https://github.com/users/testillano/packages/container/package/h2agent_builder
https://github.com/users/testillano/packages/container/package/h2agent_training