Added support for structured logs

[mambelli]

Added changes to support structured logs:

• using structlog https://www.structlog.org/en/stable/
• added supporting functions and structlog configuration in logSupport
• consolidated log and handlers configuration and set up
• updated all files using the framework loggers
• added configuration knobs
• added documentation

Structured logs are disabled by default to ease the transition. They can be enabled by adding structured="True" to the configuration of the logs (process_log sections in the Factory and Frontend configurations)

Added also some general improvements: cleanup of comments and docstrings, consolidation of util.is_true(), and fixed a couple of small bugs.

The first commits are by @MissAnita2 This PR replaces Anita's PR #325 because I reverted once the automatic unrelated changes to all HTML files and was unable to force-update when they were re-applied

[mambelli]

Closing, superseded by PR #333 Git or GitHub got confused by the rebase. Needed to do a new branch and new PR.