PHP 8.3 deprecates the use of `get_class()` without arguments. The
following alternatives should instead be used as appropriate:
- `get_class($this)` - The equivalent for instance methods
- `self::class` - The current class
Note that the behaviour of `get_class()` in a static method was
equivalent to `self::class` and _not_ `static::class`. That is to say
that the previous behaviour did not respect late static binding.
To temporarily prevent the PHP 8.2 warning about Dynamic Properties' deprecation,
the #[AllowDynamicProperties] property was added. We encourage anyone to perform the upgrade
as soon as the Google library complies with PHP 8.2.
So we are putting them under a standard PHP_MAJOR_VERSION < 8 condition.
Also, added TODO comments to remember to delete that block of code when
php80 becomes the minimum required versions in the future (Moodle 4.3?).
When possible, an issue has been created upstream, else a comment in
readme_moodle files has been added.
Finally, when the keys being freed were class or object attributes, also
nullify them (but when the calls were part of destructor methods).
Passing parameters to implode() in reverse order is deprecated, use
implode($glue, $parts) instead of implode($parts, $glue).
This commit corresponds to general search of wrong cases.
Update core (repository & portfolio) to use autoload facilities,
getting rid of not-needed-anymore requires.
Clarify a bit the readme_moodle information and expected use.
