allow preset filters and related schemas for cloud

This refactors the cloud aggregation to make use of the
SearchSQLBuilder, this in turn allows for reusing much but not all of
the default parameter

allow preset filters and related schemas for cloud

This refactors the cloud aggregation to make use of the
SearchSQLBuilder, this in turn allows for reusing much but not all of
the default parameter handling.

By allowing joins (on pid) and setting filters we can output clouds
based on the same data as a shown aggregation.

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�� Automatic code style fixes

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part of the public API of the
Aggregation class. It should no longer be called within render() but is
instead called outside.

This might potentially break plugins implementing their own
aggregations. Needs to be checked

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PHP code sniffer autofixes

Manual coding style fixes

Method and variable visibility, camel case method names. Some exclusions due to inheritance

Automatic coding style fixes

feat: show a warning if a filter is used on a cloud

refactor: directly use class, we have only 1 kind

refactor: Use Search class and hence support limit

feat: add tag cloud aggregation

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