if a composer.json is present and a PHP version requirement is
configured, we set the php version to the minimal PHP version that
satisfies the composer requirement.
Additionally, this adds a `phpVersion` attribute to the <psalm> tag. If
that's set, it takes precedence over what has been detected in
composer.json.
And finally, the --php-version command line flag continues to work and
takes precedence over the setting in the <psalm> tag
this fixes#2628
This change introduces an option to have the configuration split across
several files using standard XInclude tags. This may be useful for more
complex configs, or to include auto-generated parts into a manually
written config file.
The idea behind this is that Psalm should not use project autoloader for
its own things. So if we have a project with autoloader and no code,
then any project autoloader hit means Psalm failed to load something
itself.
Right now it highlights several issues in CoreGenericClasses stub:
- usage of `callback` instead of `callable`
- `@property-read` not resolving template parameters
