Update Symfony/Yaml to v4, add support for YAML processing #16
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Fixes wintercms/winter#13
This PR upgrades
symfony/yaml
to version 4.4 to match the rest of the Symfony components in Storm. To support oldversion.yaml
file types, this also adds processor support for the YAML parser, and adds a pre-processor that will fix up most issues in oldversion.yaml
files so that they correctly parse.I've tried to cover most bases where the new Symfony YAML parser might trip up, but if anyone can think of other cases, please let me know so I can add them to the test case.