Support retrieving and updating generic release-level data, such as support and eol dates. The JSON format has been changed accordingly to add a new top-level `releases` key.
The `aws-lambda.py` script has been updated to make use of this new feature.
This makes the format open for extension, such as adding release cycle level data (such as EOL dates).
Version data is still accessible by the version's name. While this repeats the version name, it's also much more convenient for users of those data.
A few other things have also been updated in the process:
- verbosity of the diff has been increased in update.py to make workflow summaries more readable,
- dates without timezone are now set to UTC by default (this was already supposed, so no impact expected here).
Make the script more readable, mostly by:
- using the Product classes,
- removing the use of functions when unnecessary,
- a little bit of renaming and documentation.
Also add a link to web.archive.org to fetch new oldest versions.
Create common functions parse_date, parse_month_year_date and parse_datetime.
Those functions support trying multiple formats, and come with default formats lists that support most of the date format encountered so far.
Notable change: year-month dates are now set to the end of month (impacted couchbase-server and ibm-aix).
