API: add backward compatibility to API Version 11

This adds legacy support for the old API calls. This is mostly untested
but should work. Returns might not be 100% compatible in all cases but I
did

API: add backward compatibility to API Version 11

This adds legacy support for the old API calls. This is mostly untested
but should work. Returns might not be 100% compatible in all cases but I
did my best to return the same things as before.

This will be removed in the future of course and is just to not
completely break any API usage immeadiately.

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API: code style fixes

API fix depth handling in listPages

API: clean up error codes

Error codes are now extracted from API core and printed on the OpenAPI
overview page. This makes it easier to see what is in use.

Error messages have been cleaned up, some

API: clean up error codes

Error codes are now extracted from API core and printed on the OpenAPI
overview page. This makes it easier to see what is in use.

Error messages have been cleaned up, some new codes have been assigned.

Some errors have been removed. Eg. it is fine to iterate a media
namespace you don't have read access to. The result will either be empty
or contain files from lower namespaces that you *do* have access to.

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ensure api explorer stays english

See https://github.com/Authress-Engineering/openapi-explorer/issues/207

moved OpenAPI generator to correct namespace

added missing doc blocks