fix: use displayValue to support lookups

Use displayValue, since the lookup-type only stores the row-id in the
raw-value.
But we need a workaround, since displayValue may be empty for page-types
for

fix: use displayValue to support lookups

Use displayValue, since the lookup-type only stores the row-id in the
raw-value.
But we need a workaround, since displayValue may be empty for page-types
for pages that never existed.

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feat: Adjust tag size by its count

refactor: Use Search class and hence support limit

fix: escaped filter in url

feat: add tag cloud aggregation

The basics are working but there is still a lot to do and to refactor